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 000 RPM (Speed Adjustment Required) 000 RPM (Speed Adjustment Required) Protective Body Finish Red Perma SHIELD Non Stick Coating Cutter Tip Composition Micrograin Industrial Carbide Tipped Machine Equipment Compatibility Handheld Routers and Router Tables with 1 2" Collet Pro Tip: When routing drop leaf table rule joints with this 5 16 inch cove bit and carpet adhesives off concrete subfloors this high performance layout tool cleanly penetrates the most resilient mineral surfaces while entirely avoiding edge cracking or glaze fractures This professional contractor solution resolves rapid thermal bit degradation