Check the listing for details. 1-Pack! Diamond Grinding Discs For Bolt-on Grinder For SOFT Surface 120/140Grit. Color: BLUE, Condition: New. Listed at 21.95 USD. 1-Pack! Premium Diamond Grinding Discs For Bolt-on Grinder, Hard Bond For SOFT Concrete Surface, 120/140 GritTrapezoidal diamond grinding tooling discs/ pads designed for bolt-on floor grinding machines.Diamatic - BGS-435 / 555 / 735 / 780Klindex - ExpanderCPS - G170 / 210 / 250 / 290 / 320DInnovatech / Bartell - Predator 1800 / 2400 / 32D / 32NDXHard Bond: for Soft to Medium-soft concrete.Rectangle segments are 40mm long, 12mm wide and 12mm tall.2 rectangle segments per plate.Grit Size: 120/140. For wet or dry use.**Soft bond is best in medium to hard concrete, or when the priority is on speed **Standard/Medium bond is best in medium to soft concrete, or when the priority is on life.**Rectangle segments are 40mm long, 12mm wide and 12mm tall.**2 rectangle segments per plate **Color coded based on grit** Grit size 18-30: Coarse surface finish Grit size 30-60: Medium surface finish Grit size 60-100: Fine/smooth surface finish Grit size 100-150: Ultra Fine/smooth surface finish Concrete Hardness and Aggregates Types: