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- Used where the back of the wall is inaccessible.
- Works on a spring principle. The holding arms open after the screw and holder are inserted into the hole, gripping the wall as the screw is tightened.
- Select bolts according to the thickness of the diameters from 1/8” to 1/2”.
- Fixture to be mounted must be assembled with screw and holder before inserting it into the wall.