Overhead view of the Klein Tools 47120INS insulated T-handle hex set organized in a custom foam-lined orange carrying case, including a 3/8-inch drive T-handle, extension bars, and SAE hex bits.
Product infographic showing what is included in the 9-piece set: one 3/8-inch drive insulated T-handle, 3-inch and 6-inch extension bars, and hex bits in sizes 5/16, 3/8, 7/16, 1/2, 9/16, and 5/8-inch.
Close-up of the 1000V rated insulated T-handle featuring a circular inset that highlights the white wear indication layer designed to alert linemen when the tool's safety insulation is compromised.
Action shot of a hand wearing a white Class 2 protective rubber insulating glove gripping the oversized orange T-handle, demonstrating secure ergonomic control for high-torque utility maintenance.
Open view of the high-impact protective premium carrying case for the 47120INS set, showing the precision-cut foam inserts that protect and organize the insulated hex bits and drive components.
Detailed view of a hand in a Class 2 glove retrieving an insulated extension bar from its offset storage position in the foam case, highlighting the design for easy access while wearing bulky safety equipment.
Flat lay view of the complete Klein Tools 47120INS insulated bit set inside the orange carrying case, illustrating the professional organization and ASTM F1505 certified components for live-line infrastructure work.
Klein Tools USA promotional video
Overhead view of the Klein Tools 47120INS insulated T-handle hex set organized in a custom foam-lined orange carrying case, including a 3/8-inch drive T-handle, extension bars, and SAE hex bits.
Product infographic showing what is included in the 9-piece set: one 3/8-inch drive insulated T-handle, 3-inch and 6-inch extension bars, and hex bits in sizes 5/16, 3/8, 7/16, 1/2, 9/16, and 5/8-inch.
Close-up of the 1000V rated insulated T-handle featuring a circular inset that highlights the white wear indication layer designed to alert linemen when the tool's safety insulation is compromised.
Action shot of a hand wearing a white Class 2 protective rubber insulating glove gripping the oversized orange T-handle, demonstrating secure ergonomic control for high-torque utility maintenance.
Open view of the high-impact protective premium carrying case for the 47120INS set, showing the precision-cut foam inserts that protect and organize the insulated hex bits and drive components.
Detailed view of a hand in a Class 2 glove retrieving an insulated extension bar from its offset storage position in the foam case, highlighting the design for easy access while wearing bulky safety equipment.
Flat lay view of the complete Klein Tools 47120INS insulated bit set inside the orange carrying case, illustrating the professional organization and ASTM F1505 certified components for live-line infrastructure work.
Klein Tools USA promotional video
KLEIN TOOLS

Klein Tools Hex Bit Set 47120INS 3/8 Inch Drive Insulated T Handle Set (9 Piece 1000V Rated ASTM F1505 Certified Class 2 Glove Extensions Lineman)

Only 2 left
SKU: 47120INS
$249.99 USD

Description

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Protect High-Voltage Utility Maintenance Tasks and Track Insulation Wear with a Multi-Layer Dielectric T-Handle Array

The Klein Tools 47120INS Insulated T-Handle Hex SAE Bit Set is a professional-grade 3/8-inch drive high-voltage hand tool kit engineered for live-line utility electrical operations up to 1000V. This 9-piece structural safety set features a three-part insulation architecture certified to fulfill ASTM F1505 requirements for severe-duty dielectric protection. Outfitted with an integrated white wear-indicator sub-layer that flags structural defects through the orange molding, this heavy-duty set leverages an oversized T-handle grip optimized for technicians utilizing Class 2 rubber insulating gloves to turn recessed switchgear components securely.

Best Used For:

  • Live-Line Utility Fastening: Driving heavy hex-head hardware blocks and connection couplers inside live high-voltage environments up to 1000V.
  • Recessed Infrastructure Maintenance: Passing deep into narrow industrial switchgear boxes, distribution transformer cores, and control panel cabinets via insulated extension bars.
  • High-Torque Gloved Applications: Achieving peak rotational leverage on stubborn power grid fasteners while working with thick Class 2 rubber insulating gloves.

Key Performance & Safety Features

  • 1000V Rated Protection: Engineered to satisfy rigid ASTM F1505 safety certifications for hazardous line operations.
  • White Wear-Indicator Layer: Crystalline middle layer alerts users to replace the tool instantly if the outer orange surface becomes compromised or sliced.
  • High-Torque T-Handle Profile: Oversized geometry channels muscle movement into uniform high-torque drive force without risking grip slippage.
  • Dual Insulated Extensions: Paired 3-inch and 6-inch intermediate bars deliver reliable modular length configurations for deep terminal bays.
  • Professional SAE Range: Precision-machined hex bits supply stable, non-slip 6-point interface contacts on fractional structural nuts.

What's Included

  • (1) 3/8-Inch Drive Insulated T-Handle Wrench
  • (1) 3-Inch Insulated Drive Extension Bar
  • (1) 6-Inch Insulated Drive Extension Bar
  • (6) Insulated SAE Hex Drive Bits: 5/16", 3/8", 7/16", 1/2", 9/16", 5/8"
  • (1) Heavy-Duty Transport Carrying Case with Custom Foam Inserts

Technical Specifications

Brand Manufacturer: Klein Tools
Model Number (SKU): 47120INS
Product Type Category: Insulated T-Handle Hex Bit Set
Voltage Safety Limit: 1000V Maximum
Safety Standard Code: ASTM F1505 Certified
Drive Size Standard: 3/8 in Square Drive
Measurement standard: SAE (Imperial Fractional)
Handle Geometry Style: Oversized Insulated T-Handle
Primary Metallurgy Base: High-Strength Steel Alloy
Wrench Surface Finish: Satin Nickel Plating
Total Kit Component Count: 9 Pieces (Plus Protective Container)
Overall Case Length: 15.0 in
Overall Case Width: 11.0 in
Overall Case Height: 3.0 in
Total Structural Weight: 6.3 lbs
UPC Tracking Code: 092644610851

PRO-TIP: When seating bits into deeply recessed bus bar couplings, click the extension assembly onto the T-handle anvil first, then guide the hex tip straight into the fastener cavity until it seats flush. This inline alignment protects the outer molded insulation from scraping against sharp metallic enclosure borders, preserving the structural life of your safety gear.