ProFit 1018 1210 Carbide Tipped Multi Purpose Hole Saw, 8 9/32-Inch, Yellow Cut at least 500 holes in wood Cut through Fiber Cement in less than 4 seconds and keep cutting Cut through wood and wood composites, fiber cement, fiber glass, soft bricks, ceramic tiles, lead, plastics, and aerated concrete Quick Lock system - Change between hole saw sizes and styles in seconds, enlarge an existing hole and drill at an extreme angle Multi Purpose - Only Accessory needed is the QLH1MP, QLH2MP, QLH1MPCT or the QLH2MPCT. Cannot use this hole saw without one of these Quick Lock center drills The need for a common arbor is eliminated. This system only requires the use of a ProFit center drill. Center drill QLH1MP for sizes 5/8 to 1 3/16 or QLH2MP for sizes 1  and up. When cutting on tile or soft stones use center drills QLH1MPCT or QLH2MPCT (carbide tipped)