Featuresr clamping on the place you want to clamp regardless of the place you want to clamp is horizontal vertical or cylindrical which less than 470 inches in width will work according to your requirement change the clamp opening size suitable for railing gunwale pickup truck kayaks lawn chair etcr not restricted by the angle and direction the clamp opening size is 35 11cm 138 433in in width adjustable fishing rod direction and elevation angler ultra firm on position fix