API AC1081 Clamp for Mounting Truck Caps on Ford F-150 2004 & Newer (1 Clamp) Clamp designed to mount truck caps on Ford F-150 pick-up trucks Constructed of tempered aluminum with a mill finish Complete installation guide A = 1" B = 3 1/4" C = 0" - 7/8" (See technical drawing above) Made In USA