GLI Pool Products 20″ Commercial Pool Cover for In-Ground Pools T-base design provides exceptional stability for commercial applications Base kit made from high-quality commercial-grade structural aluminum Standard 3″ commercial-grade locking casters for easy rollaway storage Cranks on both ends allow for easy 1- or 2-person operation Super-strong 4″ anodized aluminum tube kits Tube kits are pre-drilled for easy assembly Heavy-duty aluminum crank handle for easy reeling of the solar blanket cover, constructed with a powder coat finish for extended life Includes a 5-pole set: 3 poles with a 3¾” diameter and 2 poles with a 4″ diameter Solar cover not included