HSR15-1500 mm Linear Guide Rail: This linear guide rail set includes one piece of 1500 mm/59' long HSR15 rail shafts and 4 bearing blocks with smooth sliding. High-Quality Steel Material: Linear bearings are made of quality bearing steel. Beautiful and anti-rust surface treatment ensures durability, high hardness, and stiffnesssmooth running, low noise, and non-pollution. Premier Linear Guiding System: Linear guides and rails provide a smooth and precise guiding surface on which the rolling element of a linear bearing rides. It helps to build an economical linear guiding system and is designed to achieve high precision linear motion, low friction coefficient. Easy to Install: Steel support rail with pre-drilled holes for easy mounting. Stainless steel Linear optical axis guide bearings linear movement. Easy to install, no need for maintenance