The connection of the trapezoid diamond grinding plate is usually magnetic with holes. The size of holes can be M6 threaded holes or 9mm un-threaded holes. M6 threaded holes can fit many different brands of floor grinders and 9mm un-threaded holes can fit ASL floor grinders. This diamond grinding plate is designed with 2 diamond segment bars. Trapezoid type with 3 numbers of 9mm unthreaded holes suit for ASL floor grinders. 12mm segment height lengthens its lifespan. Every concrete floor is different - Sunny Superhard Tools offers you different types of metal bonds to suit different concrete floors. Trapezoid diamond grinding plate for concrete grinding. 3 numbers of 9mm holes for ASL floor grinders. High performance with excellent diamond formulas. Different metal bonds fit different hardness of concrete. Long lifespan with 12mm segment heights. Optional Specifications Optional Diamond Grit 6#, 16#, 36#, 60#, 80#, 120#, 180#, 220# Optional Metal Bond extremely soft, very soft, soft, medium soft, hard, and very hard Optional Packaging 6 or 9 pieces per box Optional Painting Color High light or Matt, common colors are: orange, yellow, red, black, purple and blue Other services OEM/ODM service is available, such as logo engraving(free), painting color(free), and etc. SYF-A07SYF-A34