In RWS1808 miniature linear guidance sets, two rows of rolling elements are in line contact with the raceways. This line contact means the units offer high load carrying capacity and rigidity. Cylindrical rollers are available in an â€˜Oâ€™ or â€˜Xâ€™ arrangement. The linear guideways are made from through-hardened steel and are ground on all sides. The raceways for the rolling elements are precision ground. The guideways are screw mounted from above to the adjacent construction. They have fixing holes with counter bores for the screw heads.