METAL MUSHRROM FIXING 8MM X 60MM BAG OF 50- Metal mushroom fixinbgs are designed to anchor insulation material to concrete and masonary substrate materials for a quick install. Drill an 8mm hole. minimum of 10mm deeper 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.