Super Heavy Duty Machinery Cast Iron Wheels Dolly Caster. These Measure 21 1/4" Long 4 1/4" Wide.
Solid Steel Wheels are 3" Diameter and 2 1/4" Wide. They would raise whatever they are under by 4 1/4.
The Iron on these is 3/4 Thick, they are ridiculously heavy at over 33 pounds for each set. One set has grease fittings, the other set has the grease fittings broke off.