... and nylon wheels ***Provides high visibility and easy 4-way access. Ensures quick and efficient inventory control ... , throughout the workplace consists of the following: 4 posts, 4 shelves, plastic shelf clips, donut bumpers and ... ” x 24” shelves). Starter Units include 4 posts, 4 shelves and post sleeves. The Add-on Units ... -hooks. Add-on units can be attached end-to-end, back-to-back, or at right angles ...