Coral Frag Rack, XL 40 Hole, Rim Hook

This is a set of two flat plates with 40 holes between them. Each hole takes the stem of a coral frag plug, so the plug stands up on the plate. Both plates are the same, 20 holes each, and each one carries its own mount. One 40 hole plate would be wider than our print bed at this hole spacing, so two plates is how you get 40 holes and keep the wider spacing. The holes measure 10.125mm across and they run all the way through, so the length of the stem does not matter. Holes sit 38.1mm apart, center to center, and the plate is laid out for plug tops up to 25.4mm across, about 1 inch. Between the plug holes are smaller open holes. They cut the weight of the plate and let water move through it. There is no standard size for a frag plug stem. Most racks skip that fact. Brands publish 9.0mm, 9.525mm (3/8 inch), 10.0mm, and 11.113mm (7/16 inch) stems, and one brand sells two of those sizes in its own store. One plug on the market is square, not round, and no round hole suits it. This rack is cut for the 9.525mm (3/8 inch) stem, the one the most brands publish, plus a little room around it. This one hangs on the rim. A clip straddles your tank wall. It opens to a wall up to about 12mm thick, and a nylon thumb screw takes up the slack on anything thinner. Turn the thumb screw down until the clip sits firm on the glass. Nylon will not scratch glass. The thumb screw is not included. The plate hangs below the rim and leans back a little, so the plug tops face up. We print in PETG. Aquarium keepers have used it submerged for years. Rinse before use.