... quality,Exquisite design with precise craftsmanship 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 ... castor unlockableoptional lock for front door and side doorbottom base19 open frame single19 open frame double