The Shepherd Hardware 2 inch medium duty threaded stem casters come with a double race rubber. Double ball bearing design assures easy swiveling.

2 inch diameter soft black rubber wheel with double ball bearing swivel, threaded stem mount and chrome finish
5/16 inch threaded stem is 1 inch long for secure installation
80-lb load capacity
Soft rubber wheels and double ball bearing construction for instant swiveling and near-silent operation on hard surface floors
A great general-duty choice for home or office use and the standard for wood-base office furniture, equipment, and displays