Krowne Metal 28-172S casters are designed for 1" square post shelving, featuring locking wheels for stability. Each caster has a 5" diameter and supports a load capacity of 220 lbs, making them ideal for heavy-duty use. These grease-resistant casters raise the height of your equipment by 6", ensuring easy mobility and access. This set includes four casters, compatible with AMCO shelving systems.