Hole Pro X-305 1-7/8" to 12" TWIN BLADE ADJUSTABLE Pro Hole Saw Cutter Cuts Plywood Sheetrock Plaster Fiberglass OSB Plastic MDF Hardie: Includes Tungsten Carbide & HSS blades Twin blades for faster/smoother cutting, strong shield traps dust & controls cutting depth User replaceable High Speed Steel and Tungsten Carbide Blades with 1-1/8 cutting depth Cuts plywood, sheetrock, veneer, cement board, slate, ceiling tiles, etc. 14" OD - Adjusts infinitely for holes 2" to 12", Shield turns drill into portable drill press to use anywhere Complete kit - add your 1/2" drill chuck  Needs  power of hole saws so bigger holes easily cut