We had a small wire shelf that needed to be moved easily. I ordered these because I couldn't find a hardware store that stocked the correct thread rollers - most of them were oversized 3/8" studs. as long as the bottom is reasonably smooth.
Pros
STRONG CASE REINFORCED WHEELS. Durable Outwater Twin Casters are made from Nylon 6. Laboratory tested to have a dynamic rating of 49lbs and a static rating of 75lbs. These wheels are more powerful and last longer than other reels due to their unique design. Sturdy steel hardware and axles ensure the longevity of the product.