Allows BLUMotion Clip Top Hinges to be used with hinge cup hole less than 13mm deep. The spacers fill in the gaps for a solid interface. Often necessary for retrofitting or for thinner doors and narrow stiles where drilling a 13mm cup hole risks boring through the face of the door (e.g. if the door's thickness is reduced by a profiled edge). It fills in the resulting space between the door and hinge, allowing for a shallower cup hole while maintaining proper hinge function. Pair.