The Stelron SS series unit consists of a single hardened slide bar having a flat surface ground over its full slide length, two in line re-circulating linear ball bearings, and an eccentric adjustable roller, all assembled into a compact housing. The slide bar ends may be obtained either with plain ends or with flat square surfaces to facilitate mounting of tools and actuating links. These units combine the compactness of a single slide bar with a feature for eliminating any play or shake between the rolling elements. This is done by means of an eccentric pin and roller contacting the flat surface of the slide bar thus preventing any rotation or play. The housing incorporates felt wipers and mounting holes.