Features:Drill Bit Extension: Hex Shank Diameter: 1/4 inch (6.35 mm); Hex Socket Diameter: 1/4 inch (6.35 mm)Sturdy and Stable: Made of premium Chrome-vanadium alloy steel for high strength and hardness, sturdy for long timeEasy 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 efficiencyQuick 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 secondWidely 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 conversionNotice:1.Actual color may be slightly different from the image due to different light effect2.Please allow 1-3cm deviation due to manual measurementmaterial: Chrome-vanadium alloy steelLength: 60mmSize: As picture show