Sparehand VR-851 Roof Mount Kayak Saddles is a perfect universal transportation system for your boat. It is compact and sturdy to haul your boat easily and safely. VR-851 is designed with a universal mounting system that can fit all types of cross bars. (square, round, oval and factory) Anti skid rubber pads are flexible and will conform to various hull shapes. Saddles can be positioned according to the width and size of your boat. It"s a great way to protect your boats as well as maintain transport stability. Easily mounted for use. Product Dimension: 9" x 5" x 5" each piece. Total 4 pieces.