Pack Rack Pack Rack Plus - Single PRP1 For use on ATVs, bicycles, and shooting carts to carry 1 item  rifle, shotgun, bow, fishing rod, shovel, etc. Aircraft grade aluminum blocks attach to handlebars and any tubular/square bars or railings 1/2 to 1 in diameter Internal steel core covered in thick soft rubber; Rubber straps attach over holder for added security Rubber fins cushion and grip item; Alternating long and short rubber fins provide custom fit Full 360-degree rotation; Firmly grip different sized objects by simply twisting the holder and locking the wing nut