Designed for the Simply Tidy's Modular Cube and Modular Panel Cube (each sold sold separately), these locking and non-locking casters allow you to move your chosen storage cube easily. You can use the included hardware to quickly attach these wheels to the compatible storage cube of your choice. Click here for assembly instructions. Details: 1.5" (38 cm) each 132 lb. (59.8 kg) maximum load limit 4 pieces Adult assembly required Hardware included Nylon and iron Compatible with Simply Tidy's Modular Cube and Modular Panel Cube (each sold separately) Contents: 2 locking casters 2 non-locking casters