The YakAttack GearTrac Hardware Assortment Kit contains four of the Convertible Knobs, 11/2in. Mighty Bolts, Track Nuts, 1 1/4in. Socket Head Cap Screws. These can also be used to mount accessories to the MightyMount as well as other standard track systems. This pack provides replacement parts as well as parts for custom rigged kayaks. Features: Width: 0.88in., Material: Aluminum, Made in USA.