Features: - Made of forged aluminum magnesium. Light weight with high strength. - Spring check-lock design. Press the spring to open and automatically locked when loosen it. - 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.