This extra shelf for OfficeSource steel bookcases is heavy duty and sturdy. This shelf is made from heavy-duty 22 gauge steel and boasts a 200 lb shelf capacity. This extra shelf is easy to install, and instantly gives you a greater storage capacity for your BA10341230, BA20341242, BA30341252, BA40341272, or BA5031282 steel bookcases. Extra widths are available by special order.