Klein 660KIT2 8-piece utility socket set displaying the 6-in-1 NRHD4 square socket, 7/16-inch adapter, and 66090 6-piece slotted set.
Diagram detailing 12 SAE sizes across 6 coaxial 2-in-1 sockets, color-coded rings, and side alignment slots for pole hardware.
Diagram highlighting the NRHD4 6-in-1 square socket with a 6-inch hollow shaft, 7/16-inch adapter, and 2 coaxial spring-loaded sockets.
Open molded storage carrying case organizing six 12-point coaxial sockets with laser-etched size callouts from 3/8 to 1-1/8 inch.
Gloved lineman using the side slot of the NRHD4 socket to align and thread a long screw-in hardware shaft on a utility pole.
Utility worker in safety gloves turning a curved pole eyebolt using the NRHD4 slotted impact socket attached to a cordless driver.
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.
3-in-1 Slotted Impact Socket (Cat. No. 66031) promotional video
Klein Impact Sockets promotional video
Klein 660KIT2 8-piece utility socket set displaying the 6-in-1 NRHD4 square socket, 7/16-inch adapter, and 66090 6-piece slotted set.
Diagram detailing 12 SAE sizes across 6 coaxial 2-in-1 sockets, color-coded rings, and side alignment slots for pole hardware.
Diagram highlighting the NRHD4 6-in-1 square socket with a 6-inch hollow shaft, 7/16-inch adapter, and 2 coaxial spring-loaded sockets.
Open molded storage carrying case organizing six 12-point coaxial sockets with laser-etched size callouts from 3/8 to 1-1/8 inch.
Gloved lineman using the side slot of the NRHD4 socket to align and thread a long screw-in hardware shaft on a utility pole.
Utility worker in safety gloves turning a curved pole eyebolt using the NRHD4 slotted impact socket attached to a cordless driver.
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.
3-in-1 Slotted Impact Socket (Cat. No. 66031) promotional video
Klein Impact Sockets promotional video
KLEIN TOOLS

Klein Tools Impact Socket Set 660KIT2 8 Piece Utility Lineman (1/2 Square 7/16 Hex Drive Slotted Square Hex Hardware Installation Kit)

Only 2 left
SKU: 660KIT2
$461.36 USD

Description

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Klein Tools 660KIT2 8-Piece Utility Lineman Slotted Impact Socket Set

The Klein Tools 660KIT2 8-Piece Impact Socket Set bundles the NRHD4 6-in-1 Square Impact Socket with the 66090 6-piece 2-in-1 Slotted Impact Socket Set into a comprehensive driving kit engineered for power utility pole line maintenance. Forged from high-strength alloy steel, this 6.16 lb ASME B107.2 compliant set accommodates both 1/2-inch square drive anvils and 7/16-inch hex quick-change impact drivers. Featuring 12-point socket geometry, coaxial spring-loaded sleeves, and specialized side alignment slots, this multi-socket system allows utility technicians and linemen to service 3/4-inch, 13/16-inch, 1-inch, and 1-1/8-inch square hardware along with twelve SAE sizes from 3/8-inch to 1-1/8-inch without removing gloves or stopping work.

Best Used For:

  • Utility Pole Hardware & Eyelet Servicing: Tightening and loosening J-hooks, pole steps, eye bolts, and curved lag hardware using built-in side alignment slots.
  • Heavy Square & Hex Fastener Driving: Engaging both 4-point square utility nuts and standard 6-point hex bolts using high-torque 12-point socket profiles.
  • Impact Driver & Wrench Conversion: Operating seamlessly on standard 1/2-inch square drive impact wrenches or 7/16-inch quick-change power utility drivers.

Key Performance & Safety Features

  • 6-in-1 Square Impact Socket (NRHD4): Houses four square socket sizes (3/4", 13/16", 1", 1-1/8") with two alignment slots and a 7/16-inch hex quick-change adapter.
  • 6-Piece 2-in-1 Slotted Socket Set (66090): Consolidates twelve SAE sizes into six coaxial spring-loaded 12-point sockets featuring alignment slots for long pole hardware.
  • Hands-Free Coaxial Spring-Loaded Action: Inner socket sleeves retract automatically under forward pressure, enabling rapid, hands-free size changes aloft.
  • High-Torque 12-Point Socket Geometry: Provides flexible multi-angle positioning for fast seating on square nuts and standard hex fasteners in cramped quarters.
  • Forged Alloy Steel Construction: Heat-treated impact-rated metallurgy meets ASME B107.2 standards to handle extreme rotational torque loads.
  • Glove-Friendly Operation: Purpose-built mechanism allows workers to switch socket sizes without taking off high-voltage rubber safety gloves.

What's Included

  • (1) Klein Tools NRHD4 6-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 660KIT2
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 (NRHD4) 3/4 inch, 13/16 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 Side 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 6.16 lb (2.8 kg)
Global Trade Item Number GTIN 00092644681493

Pro-Tip: When working overhead on distribution structures, utilize the side slots on the slotted sockets to clear protruding thread shanks. Slide the alignment channel over extended J-bolts or pole steps before applying power to prevent socket binding and ensure rapid fastener seating.