The models of the QRH series with SynchMotion™ technology offer all the positive properties of the standard series RG. Controlled movement of the rollers at a defined distance also results in improved synchronous performance, higher reliable travel speeds, extended lubrication intervals and less running noise. Since the installation dimensions of the QRH blocks are identical to those of the RGH blocks, they are also fitted on the RGR standard rail and can therefore be interchanged with ease.