Check the listing for details. MAPP CASTER 146UIRB420-TOOLBOX Tool Box and Job Box Casters, 4 Polyurethane. Width: 10.000, Condition: New. Listed at 244.99 USD. This Toolbox Caster kit contains two swivel with brake casters with (4 in. x 2 in.) Polyurethane on Iron wheels & two rigid Casters with two (4 in. x 2 in.) Polyurethane on Iron. A combination of swivel and rigid casters provide you the ability to steer your toolbox in a desired direction. This kit also includes 16 one-inch long bolts (5/16), 16 nuts (5/16) & 16 washers to mount the casters to your toolbox or gangbox. Each heavy duty caster in this kit can hold up to 800 lbs per caster. All four casters together give you a total capacity of 3200 lbs for all your tools when weight is distributed evenly. Typically, larger the wheel is on a caster, the easier it is to roll. We also offer a (5 in. x 2 in.) & (6 in. x 2 in.