BOTAO Hex Shank Drill Bit Extension Screwdriver Bit Holder Extension Rod Self-locking Drill Bit Holder Quick Release Chuck Adapter Connector Durable StableMade of premium stainless steel for high strength and hardness, durable for long time. Easy to UseThis 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 HolderInterface has a locking mechanism for one-handed quick release. Press down can release the ejection bit, realizing quick replacement in one second. Widely ApplicationHex shank can fit power drills chuck, impact drivers and hand-held drivers. Used for screwdriver bits, drill, batch head and other tools for the conversion. Color: silver black Size: about 60mm long, hex hole diameter: 6.35mm Quantity delivered: 4 pieces Warm prompt: 1.As different measuring methods,it will occur 1-3 cm deviation about the items,please ensure that it is okay for you before ordering. 2. Because of different monitors and lamplight, the picture may not reflect the actual color of the item, really thank you for your kind understanding 3. Only the above package contents, excluding other products.