1, Life: 20~50m 2, Drilling materials: reinforing concrete (steel bar diameter 8~18mm) 3, Speed: 60~70 mm/min We offer: Laser Weld Diamond Saw Blades, Brazed Diamond Saw Blades, Hot Pressed Diamond Saw Blades, Cold Pressed Sintered Diamond Saw Blades, Core Drill Bits, Cup Wheels, crack chaser and tuck point blade, Router Bits & Profiles, Flexible Polishing Pads, Silicon Carbide Wheels, Core Bits