Master Mechanic, Bi-Metal Hole Saw, 1-3/4″ Arbor, M3 High Speed Steel Cut Edge, 1-1/2″ Depth Of Cut Provides Easy Cutting In The Toughest Applications, Features 3/16″ Backing Plate Which Eliminates Need For Separate Drive Plate On Hole Saws Under 3″ In Diameter & Prevents Mandrel Strip Out, Designed To Cut Hard & Soft Wood, Nail Embedded Wood, Stainless Steel, Pipe, Rubber & Conduit, Mandrels Are Available In 1/4″, 3/8″ & 7/16″, Bulk, Mandrel Not Included.