Quick release vacuum lock handle locks down on any smooth surface. Ensures accuracy and eliminates costly damage due to holesaw "drifting". Adjustable guide for all drill bits 1/4"-3-3/8" (6mm-83mm).Tip: Using water helps to extend the life of hole saws and core bits.Features:Pro-grade suction handleQuick releaseAdjustable 1/4"-3-3/8" (6mm-83mm)Use with hole saws and core bits (sold separately).