Heavy-duty mobile base for machines and equipment Adjustable in 1-inch (2.54 cm) increments to fit a wide variety of machines; Adjusts from 12x12 to 35x35 inch (30x30 to 89x89 cm) rectangle; Adjusts up to 20x52 inch (51x132 cm) rectangle Very low profile-increases machine height by less than 1 inch (2.54 cm) Four swivel casters offer ultimate mobility and positioning in your shop or garage 3 inch (7.6 cm) non-marring ball bearing wheels and foot operated steel locking levers; 650-lb.