Condition: NewType:Step Drill BitVery durable, convenient to useInterface has a locking mechanism, built-have magnetic, automatically pop up batch head, fast, fastening, greatly improve work efficiency.Suitable for drill, screwdriver, batch head and other to transferExtend all kinds of screwdriver bits, screwdriver head conversion usesSuitable for electric drill, screwdriver, wind batch transfer using to play the role of releasing bit holderThe interface has a locking function: it will be self-locked while a drill bit connect to it, grip the black chuck by your one hand and push the hex by your another hand, then the connecting drill bit can be pulled out.Rustproof, very durable, convenient to use. type: hex diameter: 6.35mm(1/4 inch )Length: 60mmMaterial: Chrome Vanadium SteelColour: Silver + BlackQuantity: 1 PcsPackage Contents:1 x Drive Quick Change Bit Drill ChuckOnly the above package content, other products are not included.Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.