... :4",4.5",5",7",9'',10'' 2.for rough medium fine floor 3.High efficiency and durable Turbo diamond grinding wheel ... :4",4.5",5",7",9'',10'' 2.for rough medium fine floor 3.High efficiency and durable Turbo diamond grinding cup ... segments are brazed on the cup wheel used for fast grinding concrete surface and floor. Big holes provide more efficient dust collection ...