SN-51 (1/4) – Inverted Cone Shape Carbide Burr 1/8 Hardened Shank Single Cut List Number SC91408 Substrate Carbide Surface Treatment Bright Package Quantity 1 Shank Diameter 1/8 Style SN-51 Shank Type Hardened Length Of Cut 1/4 Diameter 1/4 Cut Style Single SKU: SC91408 Category: SN series - Inverted Cone Related products SN-61 (3/32) – Inverted Cone Shape Carbide Burr 3/32 Shank Single Cut Item #: SC91308 SN-6 (5/8) – Inverted Cone Shape Carbide Burr Double Cut Item #: SC90121 SN-51 (1/4) – Inverted Cone Shape Carbide Burr 1/8 Hardened Shank Double Cut Item #: SC90408