HSS-Co 8% Weldon Shank End Mills 4 & 6 Flute: Series 09, Regular - Uncoated. Series 09 - Regular Series Dimensions to DIN 844. Centre cutting. Weldon shank to DIN 1835B. Shank cutting diameter: 3-6mm to +0.04 -0.0. 8-20mm to +0.05 -0.0. Available in HSS-Co 8% Uncoated (for general production machining), HSS-Co 8% TiCN Coated (extends cutter life and improves work material surface finish) and HSS-Co 8% TiALN Coated (dissipates and resists heat, reduces surface friction coupled with high surface hardness).