Kolk dismantling joints are made of steel, flange drilling acc. to EN 1092-2 (ISO 7005-2). Epoxy coated (Resicoat®) acc. to EN 14901 (DIN 30677-2) and GSK certified (RAL-GZ 662). When ordering specify material quality for tie rods (A2/A4, hot dip or galvanized).