Metallics J1513 Anchors Sprg Wing TogBt Rh Sl 1/4" Trd 20 Lgt 5" (Jar 50)

That is exactly what it is for. A spring wing toggle is a hollow-wall anchor: you drill a hole large enough to pass the folded wings, push them through, and they spring open against the back face of the drywall, plaster, or hollow block so the load is spread behind the wall rather than gripping the hole. It needs open cavity space behind the wall to deploy, so it will not work in solid concrete or brick, where you want a sleeve or wedge anchor instead.

No. Once you back the 1/4-20 screw out of the J1513, the wings drop off inside the wall cavity and cannot be retrieved. Plan on a fresh toggle for each remount, and order enough to cover rework; they come 50 to a jar.

Round head slotted is the common pick for that work. The broad round head bears directly on a fixture strap, box ear, or strut without needing a separate washer, and the slotted drive turns with a flat blade screwdriver, so no special bit is needed overhead. If you need the head to sit flush in a countersunk hole, a round head is the wrong profile.

Drill large enough for the folded wings to pass through, not just the 1/4 inch screw. The wings on a 1/4-20 toggle are pinched flat alongside the screw to go in, so the hole is noticeably bigger than the bolt diameter. Fold the wings on the toggle you are about to use, measure across them, and size the bit to that; then thread the fixture onto the screw before you push the toggle through, because the wings cannot be removed once they are inside the cavity.

It ships 50 toggle bolts in a jar, screws and wings together. That is a bench or van quantity for electricians setting strut, boxes, and fixture straps on hollow walls, not a single-piece item.