Up to 2x faster than a standard thread adapter. A hole saw is a practical tool for professionals who need to cut holes for installing pipes and cables. With the PRO Q-Lock adapter, hole saws can be changed more quickly, and holes of various diameters can be drilled more efficiently. Q-Lock is designed to help professionals using hole saws tackle their common problem: the time it takes to change a hole saw. The PRO Q-Lock chuck features a ¼-inch hex fitting, allowing for quick and tool-free changes of hole saws and pilot bits. The adapter nut can accommodate hole saws with diameters ranging from 14 to 210 mm. Designed for use with the Q-Lock quick-release adapter.