Mungo MU Nylon Plug Wall Anchors are premium Swiss Quality anchors made from high-grade polyamide PA6. MU nylon plug anchors are self-tensioning and are particularly suitable for cavities. MU plugs can be used for indoor and outdoor applications in temperatures ranging from -40 degrees fahrenheit to 212 degrees fahrenheit.  Additionally, MN nylon plug anchors are appropriate for use with drywall, brick, concrete, and particle board.