Depth adjustable 450 to 1050 mm in 25 mm increments. EIA universal 5/8, 5/8, 1/2 inch spaced 12-24 tapped holes or 0.375 inch square holes fit 19 inch rack equipment. Compatible with 19 inch rack accessories. Available with nominal frame height of 6, 7 and 8 ft. RU markings on both front and back of tapped-hole uprights make it easier to mount equipment. Floor mounting holes predrilled at 0.750 inch diameter. 12-24 rack mounting screws (package of 20) included with tapped hole model. For square hole model order screws and cage nuts separately. Can be ganged with both 2 and 4 post open frame racks. Includes complete assembly instructions. Shipped unassembled for convenient transport to job site. Uprights on the tapped-hole model are made of lightweight extruded aluminium (6063-T6 alloy) and include RU markings on both front and back of uprights. Uprights on the square-hole model are made from 12 gauge steel. Top and bottom angles made of extruded aluminium (6063-T6 alloy).