... rubber, polyurethane and nylon wheels ***Provides high visibility and easy 4-way access. Ensures quick and efficient inventory control. Ideal for mobile ... items on hand, throughout the workplace consists of the following: 4 posts, 4 shelves, plastic shelf clips, donut bumpers and 5" swivel ... 24” and 72” x 24” shelves). Starter Units include 4 posts, 4 shelves and post sleeves. The Add-on Units include 2 ...