Features: - Made of forged aluminum magnesium. Light weight with high strength. - Longitudinal tension up to 30KN (3000KG). Lateral tension up to 10KN (1000KG). - Can bear 9KN(900KG) when open the lock. - The lock adopts anti-hook design facilitate you especially when reaching to belay station. - Anti-slip nut to firmly lock. Durable and safe. - Three-stage lock design. Pull upward to unlock, avoiding automatic unlock under outside force.