With Latch, Deadbolt and 2 Hook Bolts

GU-SECURY SH2 locking system activates by closing the door and lifting the handle upwards. This action will engage the hooks into the strike plates which enhances the weathersealing properties and provides maximum security. You then simply turn the key or the knob to allow the two hookbolts and deadbolt to extend into the strikeplates, securing the door in three positions