SN-51 (1/4) – Inverted Cone Shape Carbide Burr 1/8 Hardened Shank Double Cut List Number SC90408 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 Double SKU: SC90408 Category: SN series - Inverted Cone Related products SN-81 (3/16) – Inverted Cone Shape Carbide Burr 3/16 Shank Single Cut Item #: SC91427 SN-6 (5/8) – Inverted Cone Shape Carbide Burr Single Cut Item #: SC91121 SN-2 (3/8) – Inverted Cone Shape Carbide Burr Double Cut Item #: SC90119