Series 09 - Regular Series, TiALN Coated 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. 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).