Metallics CSH10D Anchor 1/4 x 1-1/4 HWH Blue Conc Scr 5/16Hd SL (USA) (100pcs)

Yes in the face shell of hollow concrete block, as long as you hit solid material and not a void. With only 1-1/4 inches of screw, embedment is shallow, so for hollow block it's best to land in a mortar joint or the web, or step up to a longer concrete screw if you need more depth. Drywall, plaster, and hollow partition walls need a different anchor type entirely.

Either works. It is a hex washer head with a 5/16 inch head, so a 5/16 inch socket or nut driver on an impact or drill driver seats it fast, and a 5/16 inch wrench works in tight spots. The head is slotted as well, so a flat blade screwdriver will back it out if you cannot get a socket on it.

That is its normal use. It's a 1/4 x 1-1/4 blue concrete screw sold 100 to a box, the size electricians reach for to mount device boxes, conduit straps, clamps, and light strut runs to concrete or block walls and ceilings. No expansion sleeve or shield is needed, you drill and drive.

Order under Metallics part number CSH10D. Each box holds 100 pieces of the 1/4 x 1-1/4 blue concrete screw, and it is made in the USA.

It backs out with a 5/16 inch socket or a flat blade driver, which is the advantage over a wedge or sleeve anchor you cannot retrieve. Reusing it in the same hole is not advised, the threads cut their own path in the concrete and a second drive into a worn hole loses holding power. Move over and drill a fresh hole instead.