The BigStack's narrow profile takes up the least amount of rooftop space and carries up to four (4) boats on their sides. It's padded to protect your boat and vehicle and the steel reinformced arms fold down when not in use. Four boat capacity in a small package. New SteelCore construction uses a steel substrate encase in durbale foam padding. Folds down flat when not in use for the ultimate in rooftop clearance. Hullguard pads protect and keep your boat looking brand new. Locks to crossbar with SKS systems (SKS lock cores not included). AnchorHead tie-down feature offers improved strap management Includes 1 pair of Heady Duty Straps with padded buckles Includes Bow/Stern Ttie-down straps to complete kayak stability Fits round, square and most factory crossbars out of the box. New, never used, still in box. See pix below. Call 702-293-7077 for more information. Location: Las Vegas area it's NOT ok to contact this poster with services or other commercial interests nevada