30 in. Industrial Duty Full Extension Ball Bearing Side Mount Drawer SlideIndustrial rated 500 lb. drawer slides are used when no other slide will handle the load capacity required. The Hettich 3,320 series slide is a heavy duty drawer slides used in industrial application where high weight capacity or length is needed. Often used in factories, machinery, commercial applications or deep drawer fixtures, the 3320 series slides come in a range of length sizes and weight capacities of up to 500 lbs. 3 4 in. installation width