Precision linear motion guide rail shaft support SBR12 in-time delivery good quality kinds of precision available for your choice: general level, advanced, precision grade, ultra-precision stage, the top. Heavy duty type MSA and MSB series of low linear slide assembly with four 45 ° arc-contact and contact angle of the ball out in the design, provision of radial, radial and transverse direction against the direction of the same four rated load capacity, regardless of X , Y,