The v-groove ductile steel wheel is durable, can withstand high temperatures and absorb impact without failure. The wheel is precision machined 90° with 7/8" relief groove, which is for track operation and can direct the load to each face of the inverted angle iron track in production lines. It is made out of ductile iron, heavy duty core and wheel face. This wheel is unbreakable in usual service and the tensile strength is 70,000 PSI. The wheel is capable of carrying incredibly heavy loads and perfect for extreme heavy duty applications. Zerk fitting on the wheel.