Feature and function: 1.Comply with ansi/eia, rs-310-d;iec297-2; din4191:part1; din41494: part7; gb/t3047.2-92 standard, compatible with 19" international standard, metric system and etsi standard. 2.Knockdown and simple design, low cost, easy installation 3. Optional accessories(cable management, wire management, cantilever shelf, drawer flat) 4.19"frame, made by 2mm profiled steel, perforated at both sides Color:ral9004/ral7035 Pp+foam+carton