The Eagle Group SDSK-21 is a Single-Deep Skate Kit designed for the Floor-TrakĀ® High Density Storage System, specifically for 21"D shelving. This kit includes two durable aluminum skates along with all necessary parts and hardware for installation. Each mobile unit requires one kit, providing a robust capacity of up to 2000 lbs. The product is NSF certified, ensuring it meets strict public health standards for safety and quality. Enhance your storage efficiency with this reliable and sturdy skate kit.