4 Linear Ball Bushing LME30UU Work with 30mm Shafts Four LME30UU Linear Motion Ball Bushing works with a 30 mm Shafts, Size is 30mmx 45mmx 64mm, bearings are marked LME30UU.Bearings have Built-in Rubber Seals, the inner Diameter is 30mm, the Outer Diameter is 45mm the Length is 64mm.