DT DIATOOL Dry Diamond Drill Core Bits Set 4PCS 6/8/10/12mm Quick fit Hex Shank Vacuum Brazed Hole Saw for Tile Porcelain Ceramic Marble Granite

Vacuum brazed Hex Shank Quick-Change dry diamond drilling core bits set Quantity: 4 pieces; Diameter: 6/8/10/12mm; Diamond length: 10mm; 6mm: Total length: 68mm; 8 - 12mm: Total length: 80mm; Hexagon Shank; Maximum drilling depth: 30mm Wax inside for cooling, dry drilling without water for granite marble masonry concrete tile ceramic When drilling, the wax will melt to lubricate and cool the drilling surface Applying excessive pressure will not make the bit drill faster but will create excessive heat and subsecuently reduce the efficiency and life time