Jon Bhandari Drill Chuck is designed to hold drill bits in place while they are being rotated by the drill machine. They are also used to hold bits and tools heads on rotary hammers or rotary machines. The Chuck key or Manual key inside helps in getting greater torque. Quickly convert your hex shank driver into a drill. Keyless chuck, finger tightens for easy bit changes. Unlimited use in Automotives, Garages, Warehouses, Offices, Homes and in all other drill machines and rotary machines