"Heavy duty 168""L x 16""W pin-on attaching loading ramps for loading vehicles and heavy equipment weighing up to 12,000 lbs per axle. Great for loading skid loaders, heavy machinery, cars, trucks, and tractors onto truck trailers for hauling in any weather condition. The pin-on style ends are designed for use with steel and aluminum skid seat attachment brackets, which bolt or weld to the truck trailer deck, and are sold separately. Strong, dependable loading ramps, guaranteed! All-Aluminum construction Made in the USA by certified welders."