This is one of the best casters on the market.  Not only is it fashionable but it is also a one-of-a-kind leveling caster.  The GD series has a heat-treated raceway with top-notch swivel operation and longer production life.  This particular model comes with a self-contained ratcheting device to raise and lower the stabilizing pad.  The anti-vibration pad lowers to the ground to relieve pressure off of the wheel, making your equipment stationary.  It is perfect for environments where you need a steady and durable workplace.