Anchors are glued in place and used to support rigid board and batt type insulation on walls, ceilings and roof application. Anchor is a copper coated 12-gauge steel spindle on a 2" x 2" galvanized steel plate. Generally anchors installed one day and insulation the next. Anchor and glue need to be at room temperature when installed. Space anchors 12"-16" apart for ceilings and walls. 1000 per package.