Feature 1General Purpose: General purpose screwdriver 1/4 inch hex handle can be easily buckled into the electric screwdriver. 2Extra Fine: 0.3mm to 3.6mm extra fine drill bits, which can accommodate many rotating tool accessories. 3Removable: Three jaw clamp can safely fix round shank drill bits; all aluminum alloy body and detachable connecting rod. 4Portable: Convenient, safe and fast. Keyless caliper converter, from driving to drilling. 5Function: Allow the impact drive to function like a conventional drilling, and maintain the non quick replace of the drill bit and the driving factor position. Item Type: Electric Grinder Drill ChuckMaterial: High Carbon SteelPurpose: Drill Chuck for Electric GrinderHandle Type: Hex HandleShank Diameter: 1/4inChuck Clamping Range: Approx.0.3-3.6mm / 0.01-0.14in Package List 1 x Electric Grinder Drill Chuck