698672 Disston Company 698672 Master Mechanic, 1 Piece 4 Bi-Metal Hole Saw, M3 High Speed Steel Cutting Edge, 1-7/8 Depth Of Cut, 4/6 Variable Tooth Pattern Provides Less Vibration, Delivering Faster, Smoother Cuts Then Conventional Hole Saws, Features Built In 3/8 Mandrel Which May Be Used With 3/8 Or Larger Drill, Recommended For Cutting Soft Or Hard Wood, Nail Embedded Wood, Stainless Steel, Pipe, Rubber Conduit, ,Pilot Drill Included, Carded.