3221BC, 2" x 4", Zinc, Single Pulley, Designed For Use With Rope Or Cord In Indoor & Outdoor Applications, For Easy Hooking Over 1 1/2" Dimensional Lumber 2" x 4", 2" x 6", Etc., Secure With 8D Nails Or #5 Round Head Screws Not Provided, Life Lube Alloy Bearing, Die-Cast Sheave, Steel Body & Axle, Boxed Loose.