Features:<br> Drill Bit Extension: Hex Shank Diameter: 1/4 inch (6.35 mm); Hex Socket Diameter: 1/4 inch (6.35 mm)<br> Sturdy and Stable: Made of premium Chrome-vanadium alloy steel for high strength and hardness, sturdy for long time<br> Easy to Use: This drill bit holder extension is non-magnetic! It has a built-in stability lock and high-efficiency spring. Excellent concentricity can greatly improve work efficiency<br> Quick Release Bit Holder: Interface has a locking mechanism for one-handed quick release. Press down can release the ejection bit, realizing quick replacement in one second<br> Widely Application: Hex shank can fit power drills chuck, 1/4 inch impact drivers and hand-held drivers. Used for screwdriver bits, drill, batch head and other tools for the conversion<br> Notice:<br> 1.Actual color may be slightly different from the image due to different light effect<br> 2.Please allow 1-3cm deviation due to manual measurement<br> <br> material: Chrome-vanadium alloy steel<br> Length: 60mm<br> Size: As picture show<br> Package List:<br> 1/2/3pcs Quick-release bit holder