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 time 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 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 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 Notice: 1.Actual color may be slightly different from the image due to different light effect 2.Please allow 1-3cm deviation due to manual measurement Description: material: Chrome-vanadium alloy steel Length: 60mm Size: As picture show Package List: 1/2/3pcs Quick-release bit holder