Hole Pro X-230+ 1-7/8" to 9-1/4" TWIN BLADE Pro Hole Saw Cutter Electricians Installing Recessed Lights: Cuts Plywood Sheetrock Plaster Fiberglass OSB Plastic MDF Hardie TWIN BLADES for balance  NO BALANCE BARS to BREAK and finer kerf than with SINGLE Blade models CUT HOLE 1-7/8" to 9-1/4" in ceilings, walls, floors - Cut Depth control UNIQUE 5/8 threaded shaft tip to QUICKLY MOUNT CARBIDE GRIT holes saws Sturdy Carry Case and replaceable blades: Cut plywood, sheetrock, plaster, veneers, cement board, ceiling tiles, T&G LIFE TIME warranty see details under IMPORTANT Information section