Check the listing for details. 18-Pack! Diamond Grinding Discs For Bolt-on Grinder Medium Surface Grit 30/40. Condition: New. Listed at 299.95 USD. 18-Pack! Diamond Grinding Discs For Bolt-On Floor Grinding Machines, Medium Bond For Medium-Soft to Medium Concrete Surface, Grit Size 30/40Trapezoidal diamond grinding tooling discs/ pads designed for bolt-on floor grinding machinesCompatible with Diamatic, Sase, CPS, Klindex, Innovatech/Bartell Various Bolt on Floor Grinders:Diamatic - BGS-435 / 555 / 735 / 780Klindex - ExpanderCPS - G170 / 210 / 250 / 290 / 320DInnovatech / Bartell - Predator 1800 / 2400 / 32D / 32NDXStandard/Medium Bond: for medium-soft to medium concrete surfaceTwo grinding segments Grit Size: M 30/40. For wet or dry use ** Soft bond is best in medium to hard concrete, or when the priority is on speed **Standard bond is best in medium to soft concrete, or when the priority is on life.**Rectangle segments are 40 mm long ,12 mm wide and 12 mm 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: