4" x 2" Ductile Steel V-Groove Wheel Kingpinless Swivel Brake Caster - 1250 Lbs Capacity u-groove-wheel 3" x 1-1/4" Steel Wheel

3" x 1-1/4" Steel Wheel Caster with 1/2" Threaded Stem & Brake (1" Length) - 350 Lbs Cap

While not designed to run on flat iron

10" x 2-1/2" Cast Iron Rigid Caster - Part # Q7110R01STL

Wheel Diameter:8"

Ductile steel is a step up from cast iron

4" x 2" Ductile Steel V-Groove Wheel Kingpinless Swivel Brake Caster - 1250 Lbs Capacity u-groove-wheel 3" x 1-1/4" Steel Wheel4" x 2" Ductile Steel V Groove Wheel Kingpinless Swivel Brake Caster Part # P51042DVRBTLB V groove wheels are designed to guide equipment by rolling on inverted angle iron track, however, they can also operate off the track thanks to the tread on either side of the v groove. Ductile steel wheels are the next level up in capacity & durability from cast iron wheels. Made from a combination of alloys that provide excellent tensile strength, these wheels