METAL MUSHROOM FIXING 8MM X 90MM BAG OF 50- Metal mushroom fixings are designed to anchor insulation material to concrete and masonary substrate amterials for quick and easy install. Drill an 8mm hole, minimum of 10mm deeper than length of anchor. These fixings are CE approved and conforms to EN14566:2008+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 ficing should br spot painted with a suitable Anit-Corrosive Metal Primer.