The SportRack SR5511 "J" Stacking Kayak Carrier includes J cradles that easily attach to your roof crossbars. Strap the kayak down between the tops of the J cradle and crossbars with the included tie-down straps. Bow & stern tie-downs are included for securing the front and rear end of the kayak. 

 Features:

• Holds a single kayak up to 75 lbs. 17 ft. max
• J Cradle does not require adjustment, just lift boat and place it on rack
• Fits: square and round crossbars, and factory crossbars up to 3.5" in diameter
• Easy to install and uninstall
• Includes: 2 J Cradles, bow & stern tie downs, 2 heavy duty straps