Proslat Probin Kit includes 18 handy-sized Probins that are designed to hold a variety of items. With the weight capacity ranging from 33-66 pounds, these Probins are great for holding everything from nuts and bolts to paint and general shop supplies. The Probin Kit consists of 10 small (5-inch x 5.5-inch x 3.7-inch), 5 deep (6.7-inch x 5.5-inch x 7-inch), 2 large (14-inch x 11-inch x 7-inch) and 1 XL (13.7-inch x 22.3-inch x 6.7-inch) Probin. Small Probins hold up to 33 pounds, Deep Probins hold up to 66 pounds, Large Probins hold up to 66 pounds, XL Probins hold up to 55 pounds.