Ensures easy, smooth loading and unloading of cycles and other cargo. Hardened aluminum tops and bottoms are strong, lightweight and rust resistant. Predrilled to speed up mounting to planks. Planks not included. Planks must be drilled, in good condition and smaller in width than ramp tops. Tops and bottoms mount to underside of planks. Capacity: Approximately 1,400 lbs. per pair (based on use with 2" x 12" fir planks). Complete instructions and mounting hardware included. Set of 1 top and 1 bottom. Ramp Top: One-piece tops fit snugly against loading surfacetongue holds ramp on tailgate. Tongue grippers add traction. Tongue is predrilled to allow use of slip-in steel hold-down pins (included) to maximize ramp stability and prevent accidental separation. Ramp Bottom: Angled to ensure no-bump loading. Molded-in ridges on top and bottom sides help prevent ramps from slipping.