[Drill Bit Extension]Length: 60mm Hex Diameter: 1/4 inch (6.35mm) Hex Socket Diameter: 1/4 inch (6.35mm). [Durable and Stable]Made of premium alloy steel for high strength and hardness, durable for long time. [Easy to ]This drill bit holder extension is non-magnetic! It has a -in stability lock and high-efficiency . concentricity can greatly work efficiency. [Quick Release Bit Holder]Interface has a locking mechanism for one-handed quick release. Press can release the ejection bit, realizing quick replacement in one second. [Widely Application]Hex can fit drills chuck, 1/4-inch impact drivers and hand- drivers. Used for screwdriver bits, drill, batch head and other for the conversion. Material:alloy steel colour:blackandgoldandsilver Package Contents: 2 x 60mm Hexagonal Quick Coupling Only the above package content, other products are not included. Note: Light and different displays may the color of the item in the a little different from the real thing. The measurement allowed error is 1-3cm.