2 pieces of 16# round type diamond segments for coarse grinding of the concrete floor. 3 standard M6 holes makes this Lavina grinding disc can be used on other grinders. High performance and competitive price. Good packaging and fast delivery. For concrete grinding disc, the most common segment shape is segment bar, round and arrow. The quantity of the diamond segment can be 1, 2 or 3. They are used for different applicatoins. Please check the table as follows: 　Lavina concrete grinding disc 1 segment 2 segments 3 segments Round/Button Single button / bar tools are designed to be used on lighter machines. It is usually used for medium grinding and fine grinding, or where aggressive stock removal is required Designed to be used heavier machines (are not recommended for machines smaller than 25 inches). It is usually used for medium grinding and fine grinding, or where aggressive stock removal is required Not Common Bar Arrow Designed to be used on lighter grinders, for very aggressive grinding of the concrete, or coating removals. The diamond grit is usually 6#, 16# and 30#.  Designed to be used heavier machines (are not recommended for machines smaller than 25 inches), for very aggressive grinding of the concrete, or coating removals. The diamond grit is usually 6#, 16# and 30#.  Note:  The QuickChange tool design for Lavina X machines fits also LAVINA S and LAVINA Pro models, but the old QuickChange tools designed for S and Pro machines are not compatible with the X-Series grinders. 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-C03SYF-C08SYF-C09