Pack'em Folding J-style Kayak Rack Automobile Roof Top Rack Racks - 2 Sets - Satin Black Completely Assembled with all mounting hardware provided Large knobs for easy tighting and loosening Come with 2 different sets of bottom mounting plates one curved and one straight (flat), depending on your need. Folded racks are approximately 6-1/2 Our racks will accept kayaks up to 3 feet wide and weighing up to 100 pounds.