Anti-rotation fins prevent spinning during tightening of the screw. Engineered grip feature for extra holding power. Two-way expansion mechanism provides a strong anchorage in solid base materials. Application: Pictures Lighting Skirting / Dado railing Shelves Trunking Cable trays Electrical fittings Letterboxes Approved for use in: Concrete Solid Brick Solid Sand-lime Brick Aerated Concrete Block