The Umbrella holder is made of ultra-durable composite hardware that eliminates any concern about corrosion. The tube design of the holder safely carries the UV-Blocker over sized golf sun umbrella while the U-Bolt will securely attach to any chair, baby stroller or golf cart that has a 1/2" to 1 1/4" handle. Simply secure the U-Bolt to the handle with the 7/16" accompanying lug nuts. Then simply attach the ultra light weight umbrella holder to the 1.5" ball and angle it to the desired position. Tighten the large thumb screw to secure the holder in place and insert the UV Protection umbrella for the ultimate in sun protection while on the go. Sun Umbrella Holder Kit for Stroller comes complete with adjustable holder and UV-Blocker 44" sun protection umbrella that will keep you 15 degrees cooler in the sun and dry in the rain.