Metallics LCS14300 Anchors 1/4 x 3 Hx Hd Lg Dia CS St-zn (Jar 50)

No shield, sleeve, or plug is needed. A screw anchor like the LCS14300 taps its own thread directly into a properly sized hole in concrete, block, or brick, so you drill, blow the hole clean, and drive it with a hex driver. That is the main reason electrical and MRO crews use them over a drop-in or a lead shield: one-step install and the fastener can be backed out and the fixture removed without destroying the hole.

Zinc plated carbon steel is a dry, indoor-rated finish. The LCS14300 is fine for interior concrete and block work: strut, conduit standoffs, panel and enclosure mounting, equipment bases. For exterior walls, parking structures, pool rooms, coastal sites, or anywhere subject to standing water or chlorides, specify a stainless or heavier coated screw anchor instead.

The hex washer head on the LCS14300 gives you a bearing surface that clamps strut, clips, straps, and enclosure flanges flat against the wall, and it drives with a socket so you are not camming out of a Phillips recess at 3 inches of thread. A flat or countersunk head is the one to pick when the fastener has to sit flush in a countersunk hole, such as under a plate or a track.

Hollow concrete block is workable if you land in the solid web or the mortar joint rather than the void, since the thread needs material to bite. Do not use them in drywall or plaster alone, where you want a toggle or a self-drilling drywall anchor instead. Solid concrete, grouted block, and brick are where a 1/4 inch screw anchor performs as intended.

Fifty pieces per jar. For an electrical rough-in that works out to roughly 25 two-hole strut or clamp points, so one jar typically covers a single room or a short overhead run. Shops standardizing on 1/4 inch hardware usually keep jars of the 3 inch alongside shorter lengths, since the 3 inch is for going through thicker material and shorter screws handle flush clip and strap work.