Set of 2 TERZO roof carrier straps, clamp-on type for easy installation. - Brand: TERZO - Type: Roof carrier straps - Mounting method: Clamp-on - Material: Nylon belt and plastic fittings - Quantity: Set of 2 TERZO surfboard (up to 4 boards) carrier attachment This is a car carrier. This is an attachment to be installed on the base carrier. You can tighten and secure the belt just by turning it. * One of the hand-tightening screws is missing from the time of purchase, and one needs to be turned with a wrench, but it works without any problems! (See photo 3) Operation confirmed Thank you for viewing.