These vertical wall mount pulleys are made of of cast aluminum with a 1-1/2 in. outside diameter cast nylon pulley on a 1/4 in. stainless steel axle. Attaches with two 1/4 in. stainless steel flat head screws or two stainless steel straps (screw and/or straps not included) Maximum halyard diameters is 5/16 in. The wall mount pulley does not come with the holes drilled for mounting,
