Suitable for electric drill, screwdriver, wind batch transfer using to play the role of releasing bit holder.
Can be used for prolonging different kinds of screwdrivers.
The 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 shank by your another hand, then the connecting drill bit can be pulled out.
Built-in magnetic, fast, fastening, greatly improve work efficiency.
Rustproof, very durable, convenient to use.

Shank type: hex shank
Shank diameter: 6.35mm(1/4 inch)
Length: 60mm
Material:Chrome vanadium steel
colour:Black+silver

Package Contents:
4 x 60mm Drive Shank Quick Change Bit Drill Chuck