The Heavy Duty verions of the RT Wheel -- DT was created by taking the already successful RT wheel design and using a glass reinforced nylon material to create an even stronger and higher impact resistant wheel. In addition to the standard applications already solved by the RT wheel family, the Heavy Duty DT Wheel is ideal for those applications where the wheel is subject to strong impact, including transport dollies, racks and other material handling items subject to impact abuse. The Heavy Duty wheel has a continuous operating temperature range up to 350??F. Capacities range from 1,000 lbs. to 1,600 lbs. per wheel. Wheel durometer is 75D. The Heavy Duty DT wheel is also offered in a standard version (RT).