9.00MM HSS-Co 8% Weldon Shank Multi Flute End Mills - Uncoated. Centre cutting. Weldon shank to DIN 1835B. 8-20mm to +0.05 -0.0. HSS-Co 8% Uncoated (for general production machining) TiCN Coated (extends cutter life and improves work material surface finish) TiALN Coated (dissipates and resists heat, reduces surface friction coupled with high surface hardness).