Vitrified Wheel Bonds Bond: VS:   SG (Blue): High stock removal; narrow/medium contact area; roughing/finishing; less burn; cool cutting . VSP:   SG (Blue): Porous bond; high stock removal; medium/wide contact area; cool cutting; less burn than VS; high chip clearance . VBE:   32A (Gray), 38A (White) and 57A (Dark Gray): General purpose; narrow/medium contact area; versatile; economical . VBEP:   32A (Gray) and 38A (White): Porous bond; medium/wide contact area; cool cutting; less burn than VBE; high chip clearance;   high stock removal . V:   38A (Orange): For fine grit; form/corner holding applications; narrow contact area . VK: 37C (Black) and 39C (Green) . Designed specifically for silicon carbide abrasives; medium to narrow area of contact . VCP: 32A (Gray) & 23A (Blue/Grey): Induced - pore, wide contact area, surface/creepfeed grinding applications . VP2: SG & A/O: Unique, controlled - porosity (NORPOR) bond for heat - sensitive applications . Grit Size Grit Requirement Finish Min . Corner Radius 46 General Purpose 32 Ra and rougher 0 . 020” 60 Commercial Finish 32 RA and better 0 . 016” 80 Fine Finish 20 Ra and better 0 . 0105” 120 Very Fine Finish 10 Ra and better 0 . 006” 150 Corner - Form Holding 0 . 005” 180 Corner - Form Holding 0 . 0035” 220 Corner - Form Holding 0 . 0026” 55