Metallics 1554B Anchor 1/4 x 4 Truss CD Tog Blt St-Zn (1000 pcs)

Toggle bolts are the right choice for hollow walls. The 1554B's spring wings pass through the hole, open behind the wall, and spread the load across the back face of the panel, which is why they work in drywall, hollow block and hollow metal where a plastic plug or a self drilling anchor would pull through. For solid concrete you want a wedge or sleeve anchor instead, not a toggle, because there is no cavity for the wings to open into.

No, and that is the point of a toggle. You drill one hole from the face, fold the wings flat against the 1/4 inch bolt, push the assembly through until the wings snap open in the cavity, then draw the bolt up tight. All the work is done from the front. What you do need is a hole large enough for the folded wings to pass through, which is bigger than the 1/4 inch bolt diameter itself.

It is a truss head with a combination drive, so it takes either a Phillips or a slotted bit. The truss head is wide and low profile, which spreads bearing on sheet metal items like conduit straps, box brackets and channel without the head sinking through a slotted hole or standing proud enough to interfere with a cover plate.

The 1554B is zinc plated steel. Zinc plating is a coating for general indoor and dry use; it is not a stainless or hot dip galvanized part, so for wet, corrosive or exterior exposure you should be specifying a stainless or galvanized toggle instead.

The 1554B ships 1000 pieces, bolts and wings together. That is a bulk electrical quantity meant for stocking a van or a job trailer rather than a single install, so it suits contractors hanging runs of strut, strap and boxes across a whole building rather than someone needing a handful.