Nylon Spiral Self Tapping Wall Anchor 10mm x 40mm Plastic Drywall Plasterboard Fastener with Conical Drill Tip for Lightweight Concrete Product Description The 10mm x 40mm Nylon Spiral Self Tapping Wall Anchor is a premium plastic fastening solution engineered for lightweight concrete / hollow block applications. Featuring a sharp conical drill tip and helical spiral body structure, this self-tapping anchor can be screwed directly into the wall surface without pre-drilling a