Manufactured from zinc plated steel. Used for attach the harness for rope access or speleology. 4132581 Dimensions 56 x 73 mm Gate Opening 0.39" | 10 mm MBS Major axis 6067 lbs | 27 kN MBS Minor axis 2247 lbs | 10 kN Weight 3.1 oz | 88 g Standards EN12275,EN362