Carbide Cutter • Rema Tip Top's High Tensile Carbide Cutters are Ideal for Preparing Nail Hole Through Section Repair Injuries • These Diamond Cut, Long-Life Cutters are Manufactured from High Quality, High Carbide Content Steel • Designed to Prepare Tire Injuries to Accept the Corresponding Combi or Combi-Stem Unit by Removing the Damage and Rounding the Hole to Prevent it From Growing After it Has Been Repaired • Injury Diameter 5/16" (8 mm)