Mobility of optional casters with the strength of a fully unitized, welded frame. Double or single pedestal configurations. MODEL SHAPE HEIGHT DESK D500 - Center drawer Double Pedestal 27''-36'' Adj 30''x60'' D50X - No Center Drawer Double Pedestal 27''-36'' Adj 30''x60'' D5R0 - Center Drawer Right Pedestal 27''-36'' Adj 30''x60'' D5RX - No Center Drawer Right Pedestal 27''-36'' Adj 30''x60'' D5L0 - Center Drawer Left Pedestal 27''-36'' Adj 30''x60'' D5LX - No Center Drawer Left Pedestal 27''-36'' Adj 30''x60'' D5PX - No Center Drawer No Pedestal 27''-36'' Adj 30''x60'' D4R0 - Center Drawer Right Pedestal 27''-36'' Adj 30''x48'' D4RX - No Center Drawer Right Pedestal 27''-36'' Adj 30''x48'' D4L0 - Center Drawer Left Pedestal 27''-36'' Adj 30''x48'' D4LX - No Center Drawer Left Pedestal 27''-36'' Adj 30''x48'' D4PX - No Center Drawer No Pedestal 27''-36'' Adj 30''x48''OPTIONSPermaTuff EdgePermaTuff Comfort Edge3'' Casters00GT Cable GrommetCPU HolderKeyboard Tray