Grizzly Industrial Bear Crawlin Heavy-Duty Mobile Base Black. Its 1200 lb. capacity steel and rubber heavy-duty ball bearing wheels and toe flip-stops are only a few of the features that will make this mobile base a staple under your machines for years to come. Adjusts from 19" x 21" to 29-1/2" x 29-1/2" Features: 1200 lb. capacity Heavy-duty rubber/steel casters with sealed bearings Reinforced/welded caster posts Adjustable steel bars Powder coated finish to protect against the elements Adjustable positive stop/rubber leveling feet 2 fixed casters and 2 swivel casters Easy float toe-flip lifting levers Corner-tight engagement bolts Weighs 37.8 lb. Specifications for Grizzly Industrial Bear Crawlin Heavy-Duty Mobile Base: Manufacturer: Grizzly Industrial Color: Black Package Contents: Grizzly Industrial Bear Crawlin Heavy-Duty Mobile Base Grizzly Industrial T28000: Bear Crawlin Heavy-Duty Mobile Base Black