Metallics J1415R Anchor 1/4 x 1-1/2 RH Hmmr Drv Ancr S (Jar 100)

That is exactly what a drive anchor is for. It is a one-shot, permanent fastener for light to medium static loads in concrete, block, or brick, the kind of work where an electrician is hanging strap, clips, boxes, or small enclosures. It installs fast with just a hammer, no wrench and no torque sequence. What it is not good for is anything you expect to remove or re-tension later, or anything carrying vibration or shock load. For removable or adjustable mounting, use a threaded anchor such as a wedge anchor or a sleeve anchor with a nut instead.

Round head. The RH in the Metallics J1415R designation is the round (mushroom) head style, which bears on the surface of the fixture rather than sitting flush. That matters if you are fastening through a slotted strap or a thin bracket, because the broader head spreads the bearing load. If your detail calls for the head to sit flush in a countersink, a round head drive anchor is the wrong profile.

No. A drive anchor is a permanent fastener. Once the pin is driven, the shank expands in the hole and there is no nut or thread to back off, so removal means cutting or grinding the head off and abandoning the body in the hole. If the fixture needs to come down for service, specify a threaded anchor instead and keep the drive anchor for permanent strap and box work.

100 pieces per jar. That is the order unit for the J1415R 1/4 x 1-1/2 drive anchor, so a single order line gets you a full jar rather than loose count. For MRO stockrooms standardizing on one strap anchor, the jar quantity keeps a single part number on the shelf for routine conduit and box mounting.