5 pack of Starrett FCH0096 14mm 9/16 bi-metal fast cut holesaw fastcut hole saw. Starrett HSS 'Fast Cut' Bi-metal Hole Saws Hardened cutting edge (6tpi alternate set) welded to a tough alloy steel body Bonded construction reduces possibility of shattering For use with cast iron, tool and stainless, steel, brass, bronze, aluminium, plastics and wood to a depth of 32mm 6.5mm arbor required for hole saw diameters 14 to 30mm.