The listing includes three sets of supported linear rails BK/BF12 (with locknuts and circlips), six supported linear rails SBR20-300/600/1000 mm rails (6 supported rails+12 SBR20UU bearing blocks), three pieces of ballscrews RM1605-350/650/1050 mm-C7 (3 screws + three ball nuts + three end-machinings), and three pieces of flexible couplings. Move without deflection, with little wear, and with little noise.