Blue Boar Heavy Duty 7/16-inch Shank Quick Change Dual Arbor Mandrel Kit for Hole Saws from 5/8” to 7” Diameter, with Both 5/8”-18 and 1/2”-20 Thread mounts.;

** SPECIAL ALTERNATIVELY see HP1596 Dual Arbor, Pilot bits, and hole saw case ****Hole Pro's Blue Boar Dual Hole Saw Arbor Kit provides two arbors for the price of one. Dual Arbor mandrel fits in space of a single standard hole saw arbor. Comes with a 7/16 inch hex shank for greater gripping capability in drill chuck. Backing plate has two snap pins which lock into the holes on backing plate of hole saws for efficient transmission of drill torque to the hole cutter. It can be used in 1/2 inch capacity drills and larger. The Dual Arbor Kit includes both a 5/8-18 thread arbor and an adapter with 1/2"-20 thread. Can be used on hole saws from 5/8" to 7 inches and larger. Uses any 1/4" pilot bit. Special high speed steel (HSS) pilot bit is supplied with this arbor for use on wood, metal and other materials. One arbor, one arbor adapter, and one pilot drill bit per package