The rack-and-pinion gear unit with round-guided toothed rack for simple synchronous lifting movements is particularly recommended when no transverse load is required or if an exact guide is already present and an over-definition is to be prevented. Lean SL ® offers the rugged and economical alternative to the lifgo ® and is available in three sizes as well as two different versions. In addition, the gearboxes are ready for operation with various pinion shaft variants.