HOLE SAW ARBOR: Durable, heavy duty and carbon steel arbor that come complete with pilot drills. Adapt Starrett Hole Saw arbor to any power drill used by professionals. Simply screw the threaded bit into the hole saw and attach the hex shank to the drill. QUICK-RELEASE: Our holesaw arbor has a built-in quick-hitch that allows you to instantly change hole saws without tools and without removing the arbor from the chuck RELIABLE: This drill arbor is safe and reliable to use. It can hold the hole saw securely to ensure it stays in place and does not slip during drilling DURABLE: Made of a high-quality steel body for maximum durability. The superior hardness design allows this arbor to be usable for a long time PERFECT SIZE: Fitted with a 6.35mm (1/4"") high-speed steel pilot drill and fits 9.5mm (3/8"") chuck size, Shank size; 8.75mm (11/32"") Hex, Screw thread; 5/8"" (18mm) EASY TO CARRY: The compact size allows you to take your arbor anywhere to do any job. It can easily fit in any tool bag COMPATIBILITY: Compatible with holesaws of diameters 32 - 152mm (1.1/4"" - 6""). This hole saw arbor is suitable to use with Starrett fast cut (FCH), carbide tipped (CT), diamond cut hole saws.