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The TLS28D Series is a high capacity telescopic rail where the stroke is approximately equal to the overall length of the rail. The "D" indicates that it can stroke out in either direction and is sometime referred to as double stroking or bi-directional. This series is constructed with cold drawn steel rails that are hardened to provide long life even in equipment with highly repetitive motion. The bearing system consists of large diameter, caged balls. The rails are nitrided hardened and treated with the innovative T RACE NOX® process to make them highly corrosion resistant. The large balls and hardened steel raceways yield high load capacities and life.