Our 1" round chrome posts include an adjustable leveling bolt to ensure your wire shelving unit sits properly on uneven floors. We sell them in sets of four in case you need extras or replacements. Optimized for Shelving Inc. brand posts, designed with 12 threads per inch (see Product Details section below for more information) Improves stability on uneven floors Adds 1" to total height of post Not needed if casters are being used FREE SHIPPING.Ships Next Business Day.