Concrete Screw-Anchor are a totally removable, thread forming anchor, ideal for either temporary or permanent anchoring into materials such as concrete, brick, hollow brick or block. The Concrete Screw-Anchor is particularly well suited to close-to-edge or close-to-anchor fixing as it does not expand and burst the surrounding substrate. Features a serrated Hex Flange Head for high clamping force and vibration resistance. Box Qty 50