Please see photos and respond only to my Craigslist ad - it is linked to my real email address. These items are in the Dallas, Texas area, and cannot be economically shipped:
The ball-bearing casters have grease fittings on both the wheels and the swivels, and the wheels are replaceable.
The bases are were built for a commercial application where each would hold well over 1000 lbs of equipment. The mounting surfaces are precision-machined flat within 0.002", and mounting bolts are included.
These bases are very heavy, and require two people to lift. They will be many times more stable and vibration-free than the cheap "wheel kits" normally sold for power tools.
I am selling these bases for less than the price of one caster wheel from Grainger!
Thanks and regards,
Marty