Standard Carbide 557 Description Head Diameter (mm): 1.0 Head Length (mm): 4.2 Overall Length (mm): 19.5 An account is required to purchase on Trihawk. More info Create account Login SKU: FG 557 Categories: Featured Burs, Crosscut Straight Fissure, Standard Carbide Burs Related products Standard Carbide 58 Head Diameter (mm): 1.2 Head Length (mm): 4.2 Overall Length (mm): 19.5 Standard Carbide 558 Head Diameter (mm): 1.2 Head Length (mm): 4.2 Overall Length (mm): 19.5 Standard Carbide 56 Head Diameter (mm): 0.8 Head Length (mm): 4.2 Overall Length (mm): 19.5