Metallics MDR58 Drive Ring 5/8 N-O Galv St-zn (Bag 10)

The MDR58 is the 5/8 inch drive ring, so it supports runs sized to a 5/8 inch ring opening. Other sizes in the Metallics drive ring line are available by request if your run is larger or smaller.

No. The MDR58 is not Buy American compliant and is not ARRA compliant, and country of origin is listed as multiple. On federally funded work with domestic sourcing language in the spec, you will need a domestically produced support instead.

It is a nail-on design: the integral drive pin is hammered straight into wood framing (studs, joists, plates), so there is no pilot hole, no screw and no second piece of hardware. That makes it faster than a two-hole strap for securing a run along framing, but it only works where you have wood to drive into. For masonry, concrete or steel you need an anchored clamp or strap instead.

It ships as a bag of 10, and the order minimum is 10 each. If you need larger counts for a full rough-in, other quantities can be had by request.

The ring is steel with a zinc galvanized finish, which gives it corrosion resistance suited to crawlspaces, basements and unconditioned mechanical spaces. For direct outdoor exposure or corrosive wash-down areas, a stainless or coated support is the better call.

They are used across electrical, plumbing, heating and air conditioning work. Electricians run them for cable and small conduit, and the same ring supports small-diameter tubing on mechanical rough-ins as long as the line suits a 5/8 inch opening.

No separate fastener is required. The drive pin is part of the ring, so a hammer is the only tool needed on wood framing. Nothing else gets ordered to complete the install.

Weight is listed at 0.14 lbs, with packaged dimensions of 4 x 4 x 1.5 inches. Light enough that a dozen bags add almost nothing to a van load for a full rough-in.