Lenox Tools 2991818CG Master-Grit Carbide Grit Hole Saw, 1-1/8-Inch or 29mm Carbide grit hole saw cuts through a wide range of abrasive materials Hole saw has a clean-cutting carbide grit edge that won't snag or chip when cutting thin materials Use the hole saw with a 1L or 4L standard arbor 1-1/8-inch diameter 1-inch pipe tap