High quality TPR/PUcaster bearing:350pounds bolt hole diameter:8.5mm ... , 4inch, 5inch, 6inch, 8inch.Applicable temperature: -20 ---80centigrade.Fork:MaterialL High quality cold-rolled steel plate Finish: Zinc plated, Threaded stem ... appliance equipment, Tool appliance cart, and hotel handcart.Especially suited for use in hospital , hotels,and food services.optional side axle brakesizerigidplate ...