This FC Linear Guide Rail Set includes two 1000 mm (39.4 in.) SFC20 linear shafts, four SC20 slide blocks, and four rail supports. Each slide block features a dynamic load of 882 N and a static load of 1370 N. The linear guide rail is constructed from carbon steel and aluminum with a chrome-plated surface for excellent rust resistance and long service life. The four aluminum slide blocks with built-in ball bearings deliver smooth and stable sliding performance. The fully sealed aluminum slide blocks work with the carbon steel linear shaft to provide low-friction, low-noise movement without tilting, ensuring effortless and precise control. With high-precision circular shaft dimensions and straightness, this guide rail guarantees high accuracy, repeatability, and stability during operation. The sturdy aluminum base and slide blocks come with precisely positioned mounting holes for easy, reliable installation.