9782 Size: 4" Features: -Swivel plate caster.-Steel wheel.-Cast-Iron wheels have an exceptionally long wear life.-Can withstand temperature extremes.-For infrequently moved objects on rough wood and concrete floors.-Load capacity: 250 lbs (3"), 500 lbs (4"). Construction: -Steel construction. Dimensions: -3" Dimensions: 3.75" H x 3" W x 4.5" D.-4" Dimensions: 5" H x 4" W x 6" D.