1.for 19-inch equipment; 2.beams are graduatedin U; 3. loading capacity of over1000kg 4.high-quality castor made of cold roller metal sheet with polyester-epoxy powder coating 6u, 9u, 12u, 15u, 18u, 24u, 27u, 33u, 37u, 42u and 45u with a depth of 450, 600,800, 970 and 1100.