Klein Tools Impact Extension 31088 6 In Dual Lock (1/4 In Hex Shank Quick Release Twist Locking Mechanism Driver Bit Adapter Holder Heavy Duty Kit)
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Klein Tools 31088 6-Inch Dual-Lock Impact-Rated Bit Extension
The Klein Tools 31088 6-Inch Dual-Lock Impact Extension functions as an extended-reach driving holder engineered to lock 1/4-inch hex power bits into impact drivers and drill chucks during tight-clearance fastening. Measuring 6 in. L x 0.65 in. W x 6 in. H and weighing 0.19 lbs. (3 oz.), this tool incorporates a dual-action retention mechanism combining a push-button quick-release fitting with a secondary mechanical twist lock to stop driver bits from detaching inside deep component cavities. Constructed from heavy-duty alloy steel and anodized aluminum with a black oxide coating, this 1/4 in. hex shank shaft allows electricians, HVAC technicians, and carpenters to transfer high-torque rotation across recessed electrical boxes, framing studs, and ductwork assemblies.
Best Used For:
- Recessed Fastener Clearance: Driving self-tapping screws and hex bolts inside deep wall cavities, electrical enclosures, and equipment housings up to 6 inches deep.
- High-Torque Bit Retention: Securing 1/4 in. hex driver bits, spade bits, and nut setters during heavy impact driving where standard ball-detent holders drop bits.
- Gloved Quick-Change Operations: Swapping driver bits rapidly on active construction sites utilizing high-friction textured lock collars designed for gloved hands.
Key Performance & Safety Features
- Dual-Locking Retention System: Integrates a primary quick-release push button with a secondary twist-lock collar to guarantee absolute bit retention under intense vibration.
- Impact-Rated Alloy Steel Construction: Heat-treated alloy steel core shaft withstands repetitive rotational torque spikes from high-torque 1/4 in. power impact drivers.
- High-Friction Tactile Collar Grips: Ridged quick-release collar and knurled twist lock provide positive manual leverage when operating with thick work gloves.
- Universal 1/4-Inch Hex Interface: Accurately accepts all standard 1/4 in. hex power bits, insert bits, spade drills, and nut driver attachments.
- Black Oxide Protective Finish: Corrosion-resistant black oxide surface coating shields internal lock components from rust and mechanical wear.
- Balanced Extension Geometry: Concentric shaft alignment minimizes rotational wobble at high RPM speeds to protect screw head recesses from stripping.
What's Included
- (1) Klein Tools 31088 6-Inch Dual-Lock 1/4-Inch Hex Impact Bit Extension
Technical Specifications
| Brand Manufacturer | Klein Tools® |
| Model Part Number OEM SKU | 31088 |
| Tool Classification Type | 6-Inch Dual-Lock Quick-Change Impact Bit Extension |
| Primary Drive Shank Type | 1/4 in. Quick-Connect Hex Power Shank |
| Bit Receiver Fitting Diameter | 1/4 in. Internal Hex Chuck Receiver |
| Bit Locking Mechanism | Dual-Action Quick-Release Push-Button with Twist Lock |
| Impact Torque Rating | Impact Rated (Suitable for High-Torque Impact Drivers) |
| Core Metallurgy Materials | Heat-Treated Alloy Steel Shaft with Aluminum Lock Ring |
| Surface Protective Finish | Black Oxide Shaft Finish with Orange Anodized Sleeve |
| Overall Tool Shaft Length | 6.0 in. (15.2 cm) |
| Maximum Lock Collar Width | 0.65 in. (1.7 cm) Outer Diameter |
| High-Voltage Insulated Frame | No (Uninsulated - do not use on energized electrical circuits) |
| Total Piece Count | 1 Piece |
| Net Tool Weight | 0.19 lbs. (3.0 oz. / 85 g) |
| Global Trade Item Number GTIN | 00092644310881 |
Pro-Tip: When driving long structural wood screws or backing out stuck fasteners from dense timber, push the bit into the receiver, engage the quick-release lock, and turn the orange knurled collar clockwise until it stops. Twisting the collar locks the internal sleeve pin firmly in place, completely eliminating bit disconnects even when pulling back out of sticky pilot holes.