Made by Crawford, model WM31. One of those querky gadgets that can be really helpful. Mount the roller assembly on any flat surface such as a sawhorse or work table and the steel ball bearings will enable you to move whatever you are working on in any direction. Use it with a table or band saw, sander, drill press and other power tools. The box includes . twelve 3/4'' steel ball bearing rollers . 18" long steel housing . mounting hardware . instructions in original box, not used Note the seller is in Metchosin; item still available if ad posted