Carbon Steel constructed with Zinc Plated finish provides great corrosion resistance and antirust ability for a long service life.Square cage nut designed for racks and cabinets with square holes.Special tools are required to put the nut into the hole.Mounting your standard rack mountable equipment into a server rack or cabinet.Special tools are required to put the nut into the hole.Pre-drill a 14mm x 14mm hole, fits 0.8mm-3mm thickness panel. Features M10 inner square nut.