HSS-Co 8% Threaded Shank Slot Drills 2 Flute: Series 33, Regular - Uncoated. Series 33 - Regular Series Dimensions to DIN 844. Centre cutting. Threaded shank to DIN 1835B. Cutting diameter to e8. Shank diameter to h6. 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).