For the Blum MOVENTO drawer runners, the 298.7601/RH depth adjustment is an optional addition and is used for drawers with inset fronts. The depth adjustment allows you to achieve an even gap with a simple thumb turn, aligning the drawer front with the frame. The 298.7601/RH installs directly onto the locking device T51.7601/RH, and offers ± 2mm of adjustment.