This series is made from 1/4 thick cold rolled steel; designed, formed and welded for optimal mobility and made to withstand the rigors and abuses typical for medium duty caster applications. Double ball raceways and a 5/8 nut & bolt kingpin are standard features. 14 x 10 x 10 inches. PLATE SIZE: 4" X 4-1/2". 5 out of 5 stars.