Manufactured from zinc plated steel. Used for attach the harness for rope access or speleology. 4132591 Dimensions 66 x 87 mm Gate Opening 0.47" | 12 mm MBS Major axis 10111 lbs | 45 kN MBS Minor axis 2247 lbs | 10 kN Weight 5.4 oz | 153 g Standards EN12275,EN362