Diamond 257SPM Description Head Diameter (mm): 2.3 Head Length (mm): 5.0 Grit: Medium An account is required to purchase on Trihawk. More info Create account Login SKU: 257SPM Categories: Gross Reduction & Spirals, Diamond Burs Related products Diamond 001-010C Head Diameter (mm): 1.0 Head Length (mm): 1.0 Grit: Coarse Diamond 298-016C Head Diameter (mm): 1.6 Head Length (mm): 8.0 Grit: Coarse Diamond 141-014C Head Diameter (mm): 1.4 Head Length (mm): 8.0 Grit: Coarse