Now you can put casters on items of particle board or any 5/8'' material. These 1-1/2'' diameter twin wheel casters will also add stability to the areas where they are mounted. Easy to install--simply slide metal sleeve on furniture edge, drill hole through wood, insert screw and tighten. Load rating is 40 lbs. Will raise furniture by 2-3/16'' in height. Mounting channel is 1-9/16'' long x 1-3/8'' high.