Drill accurate angles and depths with the DrillMate drill guide. This drill guide gives you complete control, self-centering and precise depth setting for repetitive drilling. It adjusts from 90 degrees to 45 degrees, and it features an easy-to-read scale cast into the aluminum base. The drill guide works with standard or masonry drill bits, forstner and spade bits, hole saws and plug cutters. It attaches to 3/8" and 1/2" power drills and comes with a 3/8" keyed drill chuck. Non-slip feet prevent slipping and marring on the surface. Mounting holes allow for mounting with screws when needed.