Telescoping precision full extension slides for high loads, up to 500 lb. capacity, with cushioned in and out stops. Chromated steel. Runner and ball race dorm a single non-detachable unit. Smooth action and high side stability through precision slide. Ball spacers made of noise-absorbing plastic with hardened steel balls. PRICE IS PER PAIR. Screws not included. 3/4" Installation Width - 3" Height.