Check the listing for details. MADE IN USA 8,000lbs Quantity 4, UPS NEXT DAY AIR SAVER. Condition: New. Listed at 230.00 USD. This is for EIGHT! 8,000lb max, 6,000lbs working skate made in Marion Ohio!! This skate uses thicker steel and larger bearings than our smaller skates. Our cost in materials, fees and shipping, is 30.00. labor is 15.00. We buy bearings in the hundreds and US steel in 20' sticks to keep our cost as low as possible. The other skates on eBay are inferior Chinese steel and are completely subsidized by the Communist party. Condition is New. 5" long 5.5" wide 1.725" high Wheels are 1.60 OD Much lower than any other model on ebay, in fact 3" lower making it super easy to put under machine. The base is threaded with 1/2-13 (course thread) to enable it to be bolted to machine and prevent skate from kicking out. When bolted on skate can be steered by turning skate with crowbar. We move Bridgeports , Mills, lathes, radial drills with these. 3 ton a skate uniform load, loads can spike above skate rating on uneven floors. Floors should be clear of debree because point loads can damage bearings as well as cracks in concrete which should be covered with sheet metal. Ratings are based on uniform bearing static load capacity which is 50% of dynamic load capacity. We are not repondsible for damage due to skate failure since we never provide guidance on use. Specifications are based on bearing static load ratings. No specification or engineering documentation is available.