METAL MUSHROOM FIXING 8MM X 170MM BAG 0F 50- Metal mushroom fixings are designed to anchor insulation material to concrete and masonary substrate materials for a quick amd easy install. Drill an 8mm hole, minimum of 10mm depper than the length of the anchor. These fixings are CE approved and conforms to EN 14566:2008+a1:2009. They are fire rated tested to 120 minutes. THe manufacturer strongly recommends that before the anchors are plastered over, the surface of each fixing should be spot painted with a suitable Anti-Corrosive Metal Primer.