Metallics QCSH3B Anchor 3/16 x 2-1/4 (1/4" Hd) Quadrive Concrete Screw USA (1000pcs)

It has a 1/4 inch hex washer head, so a 1/4 inch hex nut setter in an impact driver is what you want. The Quadrive thread form cuts its own threads in the pre-drilled hole, so no separate plug, shield or sleeve anchor is needed.

Yes. The 3/16 x 2-1/4 Quadrive is a masonry screw anchor for fastening into concrete, block and brick, and the 2-1/4 inch length leaves usable embedment after passing through a box ear, strap, clip or strut channel. For thicker standoffs or deeper fixtures you want a longer screw in the same diameter, since embedment is whatever length remains past the fixture.

They ship 1000 pieces to the box, which is a contractor bulk pack rather than a jobsite handful. Useful if you are standardizing one anchor size across a building for conduit straps, box mounting and hangers; if you only need a few dozen, a bulk carton is more than the job calls for.

They back out with the same 1/4 inch hex driver, so removal is easy, but reinstalling in the same hole is unreliable because the threads were cut into the masonry on the first pass. If you have to relocate, drill a fresh 5/32 inch hole rather than reusing the old one.