Linear rail Material: high-quality Carbon steel Chrome platedhigh precision, high hardness, super wear resistance, smooth surface without burrs linear bearing Features: high inner hole accuracy, stable and accurate speed in the working process without losing step linear guide Length:100-700mm; Diameter: 8mm threaded bar Mainly Stable structure: the motor rotor surface is coated with imported epoxy resin, the rotor is sealed as a whole, and cured at high temperature. The rotor is not easy to process residues such as iron pin after processing the outer circle. Linear Guides Package Includes: 1pcs×linear shaft