CE Smith Roller BunkCE Smith came up with their Roller Bunk with small crafts and difficult ramps in mind. Coming pre-assembled and drilled makes for easy installation. It can even be mounted on top of existing bunk boards. These CE Smith Roller Bunks can be installed using 10003g mounting brackets if lift or angle is needed, or may be bolded directly to the trailer frame for a flat bottom boat. These bunks can even be mounted on top of existing bunk boards.Product Details: Durable 2' polypropylene rollers on 1/2" shafts mounted in a heavy gauge pre-galvanized channel; Supports up to 1500 lbs of distributed weight; Instructions included; Sold in Pairs; Mounting hardware not included;