The Nylon Anchor Rawl Mush Head M6.5 X 38 are versatile “nail-in” anchors engineered for fast and secure light-duty fastening into solid substrates, including concrete, solid brick, and stone. The Mush Head (Mushroom Head) design provides a larger surface area than standard countersunk anchors. This ensures a superior “clamping” effect, preventing the anchor from pulling through the fixture and making it perfect for securing thin materials, metal tracks, or brackets where a flush finish isn’t required but a secure hold is paramount.