Quick Grafting Chuck: Screwdriver Chuck, 3/8-24unf 0.8-10mm, Keyless Drill Chuck, Adapter, Quick Change Hardware, 1/4" Converter Adapter, Industrial Power, Chuck, Chuck, Adapter, Variable Speed, Home Improvement Tool Unique Locking Function: Screwdriver chuck adapter, the self-tightening chuck vise has a unique locking function, breaking the traditional locking method with ratchet teeth, the locking piece is installed in the rear socket, the locking circumference is longer, more effective to prevent loosening during work, so that the chuck is in the most reliable clip when holding the tools. Good Metal Structure: Hexagonal shank, the keyless chuck clip has a good metal structure, the coating surface feels comfortable. Unique Axial Bearing: 3/8 self-tightening chuck, the unique thrust bearing can easily convert the torque applied by The handle has a stronger clamping force. Quick Change: The keyless self-tightening chuck can quickly replace the 1/4" adapter converter with hex shank