RWM Casters VIR-0415-08 4" Diameter X 1-1/2" Width Cast Iron V-Groove Wheel with Straight Roller Bearing, 700 lbs Capacity , Black: Amazon.com: Industrial & Scientific
SW-C6894) Stainless Steel Gate V Groove Track Wheel – Top Hardware
4" Stainless Steel V Groove Wheel - Caster City
Hamilton Caster - Manufacturer of Heavy Duty Industrial Casters and Industrial Wheels > Wheels > Track Wheels > V-Grooved Track Wheels > Iron V-Grooved Wheels > V Part Details
4 in Wheel Dia., 2 in Wheel Wd, V-Groove Track Wheel - 29XU90|VIR-0420-08 - Grainger