Our 20 gauge steel shelves are for increased strength. Legs are thick 14 gauge steel. Carts feature 4” Silent-Roll, full swivel, ball bearing casters, two with locks, max. weight rated at 125 lbs. each. They easily roll over tile, carpet, cement and hardwood floors. Cabinet walls made from 18 gauge steel. Lockable door has full piano hinge, a set of two keys, and recessed chrome handle.