Used for machining T-slots on slide tables, fixtures etc., to DIN 650. For milling structural, carburized and heat treated steel up to 900N/mm2. Sizes up to 16mm and 1/2″ have 6 flutes and 18mm and 5/8″ upwards have 8 flutes. Made to DIN 851. Shank to DIN 1835/D. Flute form 12? RH/LH. | | Metric Limits of Tolerance: | Diameter: +0.13 – 0.13. | Length: +0.13 – 0.13.