The Hettich KA3320 48" drawer slides are a heavy duty, telescoping, precision, full extension drawer slides for high loads, up to 500 lb. capacity, with cushioned in and out stops. Chromated steel. The runner and ball race form 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.;3/4" Installation Width - 3" Height. Tested Weight Capacity: 280 lbs. @ 10,000 Cycles - 183 lbs. @ 75,000 Cycles. Cabinet member requires #10 Flat head countersunk screw. Drawer member requires #10 pan head screw. Screw length will vary depending on application. Use all screw holes to achieve full load rating. PRICE IS PER PAIR. Screws not included Manufactured by Hettich America, in Buford, GA, USA.Features & Specifications of Hettich, 03320-048-44, 48" Drawer Slides, Heavy Duty, Full Extension