Our individually-sold 5" polyurethane stem casters are compatible with most 1" diameter wire shelving posts and are convenient when you require a replacement or specific amount for your storage. Sold individually, available in 4-packhere Best for cold and hot environments and smooth indoor surfaces Stem acts as plug, fits into post's bottom Resists chemicals, grease, and oil Holds 300 lbs and 1,200 lbs per set of four For stability, not recommended for use with 8"d wire shelving