... as fiberglass, particle board, asbestos board, cast iron Carbide-tipped hole saw Designed for sawing holes in abrasive materials such as fiberglass ... board, asbestos board, cast iron, and formica which bi-metal hole saw not work well. Diameter Inches mm Arbor Number 11/16171L ... , 2SL, 7L2 1/4572L, 2SL, 7L2 3/8602L, 2SL, 7L Hole Saw