Anti-corrosion protection: Galvanic zinc-plating (fire zinc-plating is also available on a special order). Connecting screws: with head pozi drive Z2 (from UPG-3/8” to UPG-5”) or with hexagonal head (from UPG-139 to UPG-500). Lining insert: material - EPDM elastomer. Thermal resistance: -40 oC to +120 oC Sound isolation: according to DIN 4109. An option of ordering clamps with silicone lining insert with thermal resistance in the range from -60 oC to +250 oC.