Material: stainless steel OH18N9. Closure: double-sided screw closure. Screws: connecting screws with head pozi drive Z2. Damping insert: Material - EPDM elastomer Thermal resistance: -400C to +1200C Sound insulation: according to DIN 4109 Optionally clamps with silicon damping insert can be ordered with thermal resistance from -600 C to +2500 C.