3D Printers Linear Bushings and Ball Bearings Set of 12 LM8UU and Set of 6 608ZZ 3D Printers Linear Bushings and Ball Bearings, Set of 12 LM8UU and Set of 6 608ZZ, The Size of LM8UU bearings is 8mm x 15mm x 24mm and The Size of 608ZZ bearings is 8mm x 22mm x 7mm.