This listing is for a set of two THK SSR15 linear bearing guide blocks with guide rails. These items are brand new and have never been used. They are designed for industrial automation and motion control applications, and are suitable for use in a variety of settings. The guide blocks are made by THK, one of the leading manufacturers of linear motion components, and are made in the United States. They are model SSR15 and come with a set of important features, including high precision, smooth motion, and long life. These guide blocks and rails are ideal for use in slides, rails, and carriages, as well as in rotary and linear motion applications. They are perfect for businesses and industries that require reliable, high-quality components for their machines and equipment.