Yakima Mako Aero Saddles Universal built-in hardware fits round, square, factory and aerodynamic crossbars right out of the box. Optimized for aerodynamic bars. Provides easy loading and a stable ride for your boat Pads protect the hull, and Dynaflex grips provide a snug hold when you tighten the straps Each set includes one Heavy-Duty Strap and one Bow/Stern Tie-Down that are compatible with SKS locking system (SKS Lock Cores sold separately) Love it 'Till You Leave It Limited Lifetime Warranty.