Medium duty caster that features a double ball swivel section, 5/8" bolt and lock nut kingpin and a 1/2" diameter drilled axle with lubrication fitting. This caster is zinc plated to protect against corrosion. It has a 4" x 4.5" x 1/4" mounting plate, 2 5/8" x 3 5/8" bolt hole spacing, slotted to 3" x 3", and a 3/8" mounting bolt diameter.