DSJ-4001 Safety Buckle for Safety Belt Climbing Outdoor Activities, Sheet Steel Metal Harness Buckles, Adjustment Buckle Safety Buckle For Safety Belt/Climbing/Outdoor Activities Sheet steel,Heat treated Min. Breaking load: 4000lbs/18kN Net weight:51.4g Meets or Exceeds: ANSI Z359.12-19ã??CSA Z259.12-16