Hexagon safety nuts type MUS-HKS similar to DIN 980 / Biloc. Designed with M6 thread for the fixing of ACT clamps of the Twin Series according to DIN 3015, Part 3. For use with hammerhead bolts type HKS. Manufactured from V4A stainless steel (material key: W55) with improved corrosion resistance by the avoidance of metallic and non-metallic contamination during production, machining and storage. STAUFF ACT clamps: Anti Corrosion Technology. Reduce crevice corrosion on the tube.