Functioning The UX with rim is suitable for prepositioned installation the UX without rim is suitable for pushthrough installation Turning in the screw causes the UX to expand in the solid building material and to knot within the cavity The required screw length is given by the plug length + fixture thickness + 1 x screw diameter Suitable for wood and chipboard screws, as well as stud screws In the case of board building materials, the threadless part of the screw must not be longer than the fixture, and the UX with rim is to be used The edge distance must be at least one plug length