RU series Utility Racks (non shock mount)
RU series     Utility Racks (non shock mount).
RU*/20        20" deep * = 2, 3, 4, 5, 6, 8, 10.
RU*/24        24" deep * = 4, 6, 8, 12, 14, 16 space.

RSX series Shock Mount Racks (Natural Rubber Mount isolation)
RSX*/24       24" deep * = 4, 8, 10, 12 space (includes 4" Xhd EverRoll caster set).
RSX*/30       30" deep * = 10, 12, 14, 16 space (includes 4" Xhd EverRoll caster set).

Rack Extras:
Stack            4 Stacking Cups installed.
Clock            Upgrade 2 non-locking casters for 2 locking casters.
RW3.5          3.5" EverRoll Caster set.
RW4             4" EverRoll Caster set.
RR*              Rear Rail *= number of rack spaces.