Klein 32791 4-inch impact bit extension with 1/4-inch hex shank and magnetic steel receiver collar for extended reach driving.
Technician aligning a 1/4-inch hex driver bit into the magnetic receiver collar of the Klein 32791 4-inch extension shaft.
Electrician using a power drill with the Klein 32791 4-inch extension to reach terminal screws inside a deep metal junction box.
Pro Imapct Power Bit Set Promotional Video
Klein 32791 4-inch impact bit extension with 1/4-inch hex shank and magnetic steel receiver collar for extended reach driving.
Technician aligning a 1/4-inch hex driver bit into the magnetic receiver collar of the Klein 32791 4-inch extension shaft.
Electrician using a power drill with the Klein 32791 4-inch extension to reach terminal screws inside a deep metal junction box.
Pro Imapct Power Bit Set Promotional Video
KLEIN TOOLS

Klein Tools Impact Bit Extension 32791 4 Inch Hex (1/4 Inch Shank S2 Steel Magnetic Holder Power Driver Recessed Box Screwdriving Adapter)

Only 2 left
SKU: 32791
$6.99 USD

Description

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Klein Tools 32791 4-Inch 1/4-Inch Hex Pro Impact Power Bit Extension

The Klein Tools 32791 4-Inch 1/4-Inch Hex Pro Impact Power Bit Extension operates as an extended-reach magnetic fastener driving accessory engineered to bridge tight clearance gaps inside electrical panel enclosures, deep junction boxes, and structural wall cavities. Measuring 4 inches in total length with a 0.43 inch barrel diameter and weighing 0.8 oz, this adapter incorporates a high-strength permanent rare-earth magnet and a standard 1/4 inch quick-connect hex power shank constructed from heat-treated S2 impact-rated tool steel. Engineered to absorb high rotational shock loads generated by power tools, this heavy-duty drive shank allows electricians, HVAC technicians, and commercial tradesmen to extend 1/4 inch insert bits into 3-3/8 inch deep outlet boxes without dropping fasteners or experiencing premature shank shearing.

Best Used For:

  • Deep Electrical Box Fastening: Reaching terminal screws, ground clips, and conduit clamps seated within 3-3/8 inch deep electrical junction boxes and switch enclosures.
  • Tight Clearance Power Screwdriving: Extending driver bit reach past obstruction points like stud framing, ductwork flanges, and equipment housings using 1/4 inch power impact drivers.
  • Magnetic Fastener Placement: Magnetizing standard 1/4 inch hex insert bits to hold steel screws horizontally or overhead during one-handed starting.

Key Performance & Safety Features

  • S2 Impact-Rated Tool Steel: Premium heat-treated alloy steel construction withstands high rotational impact torque to prevent shank twisting and snapping.
  • Extended 4-Inch Reach: Provides an added 4 inches of total shaft clearance to easily access fasteners located in deep enclosures and tight wall bays.
  • High-Strength Internal Magnet: Integrated magnetic barrel holds standard 1/4 inch hex driver bits securely while transmitting strong magnetic hold to metal fasteners.
  • Standard 1/4-Inch Hex Shank: Precision-milled quick-connect power shank fits all 1/4 inch impact driver chucks and standard drill press adapters.
  • Compact Outer Barrel Profile: Slim 0.43 inch diameter shaft barrel fits through standard knockouts and tight internal hardware gaps without binding.

What's Included

  • (1) Klein Tools 32791 4-Inch Pro Impact Power Bit Extension Shaft (1/4-Inch Hex Drive)

Technical Specifications

Brand Manufacturer Klein Tools®
Model Part Number OEM SKU 32791
Tool Classification Type 4-Inch Magnetic Impact Power Bit Extension
Primary Drive Shank Type 1/4 inch Quick-Connect Power Hex Shank
Internal Receiver Capacity 1/4 inch Standard Hex Insert Bits
Core Metallurgy Material Impact-Rated S2 Tool Steel
Fastener Magnetization Yes (High-Strength Internal Permanent Magnet)
Overall Extension Length 4.0 inches (10.2 cm)
Outer Barrel Diameter 0.43 inches (1.1 cm)
Enclosure Box Reach Depth Compatible with 3-3/8 inch Deep Electrical Boxes
High-Voltage Insulated Frame No (Uninsulated - do not use on energized electrical circuits)
Package Piece Quantity 1 Unit
Net Product Weight 0.8 oz (23 g)
Global Trade Item Number GTIN 00092644327919

Pro-Tip: When working inside crowded electrical boxes with multiple wire bundles, seat your 1/4 inch insert bit fully into the magnetic holder before placing the screw on the tip. The strong internal magnet holds the bit and screw aligned inline, preventing fastener drop-off while driving past tight conductor leads.