Nylon Screw In Plastic Spiral Expansion Anchors Self Drilling Insulation Fixing Plugs for Concrete Wall Fixing Product Description The Nylon Screw-In Plastic Spiral Expansion Anchor for Concrete Wall is a high-strength fastening solution for concrete, solid brick, and masonry hard wall applications where screw-in anchors provide superior pull-out resistance through threaded mechanical interlock with the substrate. The anchor features a precision-molded nylon PA6 body with an