Different floor grinders match with different types of grinding discs. When buying a diamond grinding disc for concrete grinding, you should choose the right model to fit your floor grinding machines. The trapezoid diamond grinding disc is the most common shape in the market and can be directly used on most of the floor grinders. Some other grinders also support a corresponding adapter plate to fit trapezoid type discs. Its connection can be bolts(3 threaded holes), pins(3 unthreaded holes) and magnets. This SYF-A04 trapezoid diamond grinding disc is equipped with 2 round type diamond segments, for medium/fine grinding of the concrete. Sunny Superhard Tools researches different excellent bonds for different hardness of concrete. We provide 2 types of packagings - 6 pieces per box or 9 pieces per box. Foam and hard boxes well protect all the diamond grinding discs. OEM/ODM services are available. 2 round type diamond segments for medium grinding of the concrete. Great bonds for different hardness of concrete. High performance and long lifespan. Optional packagings - 6/9 pieces per box OEM/ODM are available. 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.