Item No.: TSA330 Material: zinc alloy Suitable for Outdoor Indoor Use The combination lock is designed for indoor and outdoor use such as gym / sports/ school & staff lockers, gate, shed, storage, cabinets, toolbox, doors, large luggage bags etc. Security Lock CylinderThe inner liner with positive and negative groove structure. The four pin cylinders in the inner liner increase the gear ratio density and enhance the safety. Strong & DurableThe internal structure is precise, the interlocking part of the lock beam and the lock body is thick, and it is tamper resistant. The bottom is wrapped in wear-resistant plastic to prevent scratches and is durable. Multilayer Stacking TechnologyA total of 22 layers of galvanized locking plates are superimposed and fixed through 8 rivets. Experiments such as impact, drop, and collision are still intact and can effectively resist violent destruction.