Description: wheel handle, diameter, 210mm; 12 teeth gear, 32 teeth gear, 16 teeth gear, 20 teeth gear; tension controller; industrial wheel castor, diameter, 127mm; anti-tilting device; rails are made of 25mm concrete steel; built-in safety lock; close type front panel to avoid dust; polyester-epoxy power coating Optional accessories: multi-purpose shelf, plastic drawer cabinet, pull-out desk top, hanging rod, pull-out frame, pull-out drawer, divider, CD drawer, disk drawer, platform, sliding door & swing door Model and size(mm): WSF-M450-1 bay---W1060*D450*H2150 WSM-M450-1 bay---W1140*D450*H2150 WDM-M650-1 bay---W1140*D650*H2150 WDM-M860-1 bay---W1140*D860*H2150 Note: 2-bay, 3-bay, 4-bay, 5-bay, 6-bay, 7-bay, 8-bay are available