The Body-Solid Weight Stack Adapter Plate is for use on any machine weight stack. Allows you to increase resistance in 2.5 or 5 lb. increments. No need to jump in 10, 15 or 20 lb. increments any longer. Features thick, protective virgin rubber molded over a solid steel core for a lifetime of trouble-free use. Will not slip, slide or fall off. Will not damage weight stack or machine.