MGN9H linear motion guide rail – 0.5M with a Sliding block is a linear rail used for 3D printing, CNC machine, drawing bot, PCB/ IC assembly machines etc. This guide rail is to be used with the MGN9H rail block. The rail is used for smooth and precise linear motion. It is Fit for Semiconductor manufacturing equipment, printed circuit board IC assembly equipment, medical equipment. Also used in machine arm, precision measuring instruments, office automation equipment, and other small linear sliding devices.