This 4 x 2 Cast Iron V-Groove Wheel or “semi-steel” is a strong, durable and cost effective solution that can carry heavy loads. With a weight capacity of 600 lbs. and an operating temperature range of -45° to +600° Fahrenheit, this wheel can roll easily on clean, debris free floors. This wheel is not recommended for wet environments, as it can rust.
This wheel is a great option for sliding barn door projects!
For more info, check out Caster Wheel Types.