For Grinding All Tool Steels.Type 12 For Tool & Cutter Grinders (Dish). Rim 2, Back 11/16 J=6-1/4 K=3-5/8. Application: Ideal for moderate to heavy infeed rates, rapid stock removal and precision contouring. Use V40 bond for general purpose applications or medium contact areas. Use V40P bond on wide contact areas where heat is an issue.