Fixing Heavy Duty Hanging Ceiling M10 Spring Toggle Anchor With Hook Wing Bolt

Spring Toggle hook

A sharp drill bit with minimum pressure will prevent damage at the break through point.
Pass the screw through the fixture being fastened and re-assemble allowing the end of the screw to slightly pass through the yoke.
Close the wings back along the length of the screw and check that there is sufficient length of screw to enable the wings to clear the thickness of material being fastened into.
Install the fixture against the wall guiding the toggle through the hole and pressing home until it falls down into position or springs open into position. Check that the wings have opened/ fallen into place by pulling back on the fixture.
Tighten the screw, at the same time, pulling back on the fixture to keep the toggle in contact with the reverse side of the work surface. Do not over tighten to avoid stripping of the threads in the yoke.