We have a good selection of threaded stem casters with bolt sizes of 1/2" and 3/8". We will be adding a variety of different popular stem sizes soon. Available with these threaded stem caster yokes are a number of different style industrial cart wheels from Polyon aluminum, Thermo-Pro, DuraLastomer, Nomadic, Polymadic, Poly-Pro and Semi-Steel. Find which stem caster is right for you at Source 4 Industries.