Safety locking plates type SIP for the surface mounting of pipe / tube clamps and hose clamps of the Heavy Series according to DIN 3015, Part 2, in conjunction with stacking bolts type AF. Safety washers / safety discs type SI according to DIN 93 (with one wing) and DIN 463 (with two wings) for hexagon head bolts type AS. Manufactured from steel with various surface coatings (phosphated, uncoated, zinc/nickel-coated). Alternatively also available in stainless steel V2A 1.4301 / 1.4305 (AISI 304 / 303) and V4A 1.4401 / 1.4571 (AISI 316 / 316 Ti).