Safety locking plates type SIG for the surface mounting of ACT clamps of the Standard Series according to DIN 3015, Part 1, in conjunction with stacking bolts type AF. 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.