B-Line Eaton series fastener hardware and accessories, Smooth wall drop-in can be installed flush mount, Zinc plated,3/8",Hollow base drop-in

The ADH-37 is a 3/8 inch drop-in anchor, so it accepts 3/8 inch threaded rod or bolts. Body diameter is listed at .375 in and overall height is 1.3125 in, which is the depth of hole you need in the concrete.

UL Listed, per the manufacturer's data. That matters on inspected jobs where conduit, cable tray, and lighting supports have to be anchored with listed hardware.

Yes. It's a smooth wall drop-in that can be installed flush mount, so the top of the anchor sits level with the slab or deck face and nothing protrudes until you thread in the rod. That is what makes it workable under a ceiling where trapeze hangers or strut are going up tight to the structure.

A hollow base drop-in is an internally threaded shell you set in a drilled hole in concrete, then expand with a setting tool. The ADH-37 is the hollow base version, meaning the shell is open through the bottom. You drop it in, expand it, and thread 3/8 inch rod or a bolt into it. It's used where you want a removable, flush, female anchor point rather than a permanently protruding stud like a wedge anchor.

The anchor is zinc plated, which is a standard dry-to-damp interior finish. It's suitable for indoor structural and electrical support work; for exterior or corrosive environments you'd want a stainless or hot-dip anchor instead.