Hole Pro X-148 1-7/8" to 6" TWIN BLADE ADJUSTABLE 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 & control 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. 8" OD - Adjusts infinitely for holes 2" to 6, Shield turns drill into portable drill press to use anywhere Complete kit - add your 3/8" drill chuck  Needs  power of hole saws so bigger holes easily cut