Strong, durable steel construction holds the load Vinyl wrapped for durability and corrosion resistance Includes 1 pair of crossbars RoundBar SL Adapter lets you use it with StreamLine towers Required end caps sold separately or are included with RoundBar SL Adapter PRODUCT SPECS SM 48" Weight: 7.40 lbs. Dimensions: L 48.00 in x W 1.12 in x H 1.12 in PRODUCT SPECS MD 58" Weight: 8.40 lbs. Dimensions: L 58.00 in x W 1.12 in x H 1.12 in PRODUCT SPECS LG 66" Weight: 10.40 lbs. Dimensions: L 66.00 in x W 1.12 in x H 1.12 in PRODUCT SPECS XL 78" Weight: 12.40 lbs. Dimensions: L 78.00 in x W 1.12 in x H 1.12 in PRODUCT SPECS XXL 86" Weight: 24.80 lbs. Dimensions: L 86.00 in x W 1.12 in x H 1.12 in