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. | | 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).