The Rocky’s Eazy Rollers® #3 solar reel system is similar in design to the popular #3A system but uses 4″ hubs and 4″ tubing, instead of the standard 3″ hubs and 3″ tubing making it capable of smoothly rolling a heavier solar cover. It is designed for use as a portable unit. Like all of Rocky’s Rollers, just reel in the cover, release the anchor bolts and wheel it out of the way. It’s as simple as that. Uses Rocky’s 4″ commercial grade, 12-sided adjustable anodized tubing. Comes with 2″ locking castors for easy maneuvering. Ground clearance to underside of tubing is approximately 9″. Approximate shipping weight is 14 lbs.