Klein 660KIT1 8-piece utility socket set displaying the 5-in-1 NRHD square socket, 7/16-inch adapter, and 66090 6-piece slotted set.
Diagram detailing the NRHD 5-in-1 square socket featuring 3/4, 1, and 1-1/8-inch square sizes, ball detent retention, and a 7/16-inch adapter.
Diagram highlighting 12 SAE sizes across 6 coaxial 2-in-1 sockets, color-coded bands, and side alignment slots for utility pole hardware.
Close-up of the Klein NRHD 5-in-1 square impact socket beside its 7/16-inch quick-change hex extension adapter shank.
Open molded carrying case organizing six Klein coaxial 12-point impact sockets with laser-etched size callouts from 3/8 to 1-1/8 inch.
Gloved lineman using the side slot of the NRHD socket to drive a long screw-in hardware shaft directly into a wooden utility pole.
Utility technician in safety gloves aligning the side slot of an NRHD impact socket over an extended pole eyebolt aloft.
Lineman operating a cordless impact wrench fitted with a 66090 slotted socket to tighten an eyelet bracket on a timber cross-arm.
Electrician using a slotted impact socket on a power driver to turn a curved eyebolt on a wooden utility pole aloft.
Line worker aligning a Klein side-slotted impact socket over a long utility pole J-bolt to demonstrate extended thread clearance.
Klein Impact Sockets promotional video
3-in-1 Slotted Impact Socket (Cat. No. 66031) promotional video
Klein 660KIT1 8-piece utility socket set displaying the 5-in-1 NRHD square socket, 7/16-inch adapter, and 66090 6-piece slotted set.
Diagram detailing the NRHD 5-in-1 square socket featuring 3/4, 1, and 1-1/8-inch square sizes, ball detent retention, and a 7/16-inch adapter.
Diagram highlighting 12 SAE sizes across 6 coaxial 2-in-1 sockets, color-coded bands, and side alignment slots for utility pole hardware.
Close-up of the Klein NRHD 5-in-1 square impact socket beside its 7/16-inch quick-change hex extension adapter shank.
Open molded carrying case organizing six Klein coaxial 12-point impact sockets with laser-etched size callouts from 3/8 to 1-1/8 inch.
Gloved lineman using the side slot of the NRHD socket to drive a long screw-in hardware shaft directly into a wooden utility pole.
Utility technician in safety gloves aligning the side slot of an NRHD impact socket over an extended pole eyebolt aloft.
Lineman operating a cordless impact wrench fitted with a 66090 slotted socket to tighten an eyelet bracket on a timber cross-arm.
Electrician using a slotted impact socket on a power driver to turn a curved eyebolt on a wooden utility pole aloft.
Line worker aligning a Klein side-slotted impact socket over a long utility pole J-bolt to demonstrate extended thread clearance.
Klein Impact Sockets promotional video
3-in-1 Slotted Impact Socket (Cat. No. 66031) promotional video
KLEIN TOOLS

Klein Tools Impact Socket Set 660KIT1 8 Piece Utility Lineman (1/2 Square 7/16 Hex Drive Slotted Square Hex Hardware Installation Kit)

Only 2 left
SKU: 660KIT1
$403.68 USD

Description

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Klein Tools 660KIT1 8-Piece Utility Lineman Slotted Impact Socket Set

The Klein Tools 660KIT1 8-Piece Impact Socket Set combines the NRHD 5-in-1 Square Impact Socket with the 66090 6-piece 2-in-1 Slotted Impact Socket Set to provide complete driving coverage for power utility pole line maintenance. Forged from high-strength alloy steel, this 5.66 lb ASME B107.2 compliant kit connects to both 1/2-inch square drive anvils and 7/16-inch hex quick-change impact drivers. Featuring coaxial spring-loaded socket sleeves, 12-point geometry, and specialized alignment slots, this system enables linemen and electrical contractors to service 3/4-inch, 1-inch, and 1-1/8-inch square hardware plus twelve SAE sizes from 3/8-inch to 1-1/8-inch without removing rubber safety gloves or stopping work.

Best Used For:

  • Utility Pole & Cross-Arm Hardware Maintenance: Fastening and removing J-hooks, pole steps, eye bolts, and curved lag studs using dual-sized side alignment slots.
  • Square & Hex Fastener Installation: Engaging 4-point square nuts and 6-point hex bolts using versatile 12-point socket geometry that eases alignment in tight overhead spaces.
  • Dual-Drive Power Wrench Adaptability: Mounting directly onto standard 1/2-inch square drive impact wrenches or utilizing the 7/16-inch quick-change hex adapter shank.

Key Performance & Safety Features

  • 5-in-1 Square Impact Socket (NRHD): Houses three square socket sizes (3/4", 1", 1-1/8") with large and small alignment slots and a 7/16-inch quick-change hex adapter.
  • 6-Piece 2-in-1 Slotted Socket Set (66090): Consolidates twelve SAE sizes into six coaxial spring-loaded 12-point sockets with alignment slots for pole line hardware.
  • Hands-Free Coaxial Spring-Loaded Action: Internal socket sleeves depress under pressure to instantly change sizes without manual adjustment.
  • Glove-Friendly Size Switching: Purpose-built design permits rapid size changes aloft without taking off heavy high-voltage rubber protective gloves.
  • Forged Alloy Steel Metallurgy: Heat-treated impact-rated construction built to ASME B107.2 standards to handle extreme rotational torque shock.
  • Hard-Shell Carrying Storage Case: Rugged storage case keeps all seven sockets and drive adapters organized for bucket truck transports.

What's Included

  • (1) Klein Tools NRHD 5-in-1 Square Utility Impact Socket with 7/16-Inch Quick-Change Adapter
  • (1) Klein Tools 1-1/8" x 15/16" Slotted Coaxial 12-Point Impact Socket
  • (1) Klein Tools 1" x 13/16" Coaxial 12-Point Impact Socket
  • (1) Klein Tools 7/8" x 11/16" Coaxial 12-Point Impact Socket
  • (1) Klein Tools 3/4" x 9/16" Slotted Coaxial 12-Point Impact Socket
  • (1) Klein Tools 5/8" x 7/16" Coaxial 12-Point Impact Socket
  • (1) Klein Tools 1/2" x 3/8" Coaxial 12-Point Impact Socket
  • (1) Hard-Shell Storage Carrying Case

Technical Specifications

Brand Manufacturer Klein Tools®
Model Part Number OEM SKU 660KIT1
Tool Classification System 8-Piece Utility Lineman Slotted Impact Socket Kit
Core Metallurgy Material Heat-Treated Forged Impact Steel
Primary Input Drive Interface 1/2 inch Square Drive & 7/16 inch Quick-Change Hex Shank
Integrated Square Sizes (NRHD) 3/4 inch, 1 inch, and 1-1/8 inch Square
Integrated SAE Sizes (66090 Set) 1-1/8x15/16'', 1x13/16'', 7/8x11/16'', 3/4x9/16'', 5/8x7/16'', 1/2x3/8''
Socket Point Geometry Profiles 4-Point Square & 12-Point Universal Geometry
Manufacturing Quality Standards ASME B107.2 Compliant
Specialized Feature Capabilities Dual Alignment Slots & Coaxial Hands-Free Spring Adjustments
Overall Unit Dimensions 6.94 inches L x 7.06 inches W x 11.19 inches H (17.6 x 17.9 x 28.4 cm)
High-Voltage Insulated Frame No (Uninsulated - do not use on energized electrical circuits)
Total Piece Count 8 Pieces (7 Sockets/Adapters + Storage Case)
Assembled Net Package Weight 5.66 lb (2.6 kg)
Global Trade Item Number GTIN 00092644681486

Pro-Tip: When installing long eyebolts or curved J-hooks on utility cross-arms, align the side slot over the curved shank before engaging rotational power. The side channel clears extended threads and hardware curves to seat the socket squarely against the fastener nut.