... precise craftsmanship.The more perfect design. Optional Accessories for 19" Network Racks:19 wire manager 1U19 wire manager 2URing type cable manager ... key board shelf(350mm,550mm,650mm,730mm)19 sliding shelf (350mm,550mm,650mm,730mm)19 sliding shelf heavy duty (350mm,550mm,650mm ... and side doorbottom base19 open frame single19 open frame double 19 inch Network Cabinet accessories Fan