4 Linear Ball Bushing Item LME20UU Works with 20mm Shafts 20mm x 32mm x 45mm 4 Pieces LME20UU Linear Motion Ball Bushing works with a 20 mm Shafts, Size is 20mmx 32mmx 45mm, the inner Diameter is 20mm, the outer Diameter is 32mm and the Length is 45mm.Bearings have Built-in Rubber Seals