Bosch Hole Saw HDG112 1 1 2 Inch Diamond Grit Vacuum Brazed Wet Core Cutter (Quick Change Mandrel Porcelain Granite Glass Ceramic Tile Plumbing Boring Tool) Wrench Set Dual Speed Gear Box: Mechanical selector Dual Speed Gear Box: Mechanical selector switches between high power (0 420 RPM) and high speed (0 1 and core plate corrosion The Bosch HDG112 1 1 2 Inch Diamond Grit Hole Saw Vacuum Brazed for Porcelain Granite Glass and Tile Wet Cutting delivers specialized structural masonry excavation utility and exceptional hard substrate coring efficiency across demanding residential bathroom renovations Contractor Grade 1 1 2 Inch Vacuum Brazed Diamond Core Saw with Segmented Heat Dissipation Teeth and Quick Change Mandrel Integration