Master Mechanic, Bi-Metal Hole Saw, 3″ Arbor, M3 High Speed Steel Cutting 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, Can Be Used With 3/8″ Bi-Metal Saw Mandrel, Model #E0100687, True Value #896313, 3/8″ Quick Change Mandrel, Model #E0100688, True Value #102486, 7/16″ Quick Change Mandrel, Model #E0100689, True Value #752980 & 1/4″ Bi-Metal Pilot Drill, Model #E0100659, True Value #779942, Bulk, Mandrel Not Included.