SW10UU Seals on both sides NB Nippon Bearing Linear Systems Made in Japan SW10UU 5/8" Bore linear motion ball bushing/bearing, SW10UU is Seals on both sides, the inner diameter(bore) is 5/8" inch dimensions with steel retainer, bearing is high accuracy grade linear bushing, series mainly used in the USA, NB brand (Nippon Bearing Linear Systems), made in Japan.