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-81 (3/16) – Inverted Cone Shape Carbide Burr 3/16 Shank Single Cut Item #: SC91427 SN-2 (3/8) – Inverted Cone Shape Carbide Burr Double Cut Item #: SC90119 SN-53 (3/16) – Inverted Cone Shape Carbide Burr 1/8 Shank Double Cut Item #: SC90441