The Fischer Brown Contract Plugs & Screws 400 Tub is a pack of 400 brown plastic wall plugs and screws. The plugs are designed for use in solid walls such as concrete, brick, and masonry. They are available in a size of 7mm x 40mm, and come with screws that are 4mm x 40mm. The plugs are made from high-quality plastic that is both durable and weatherproof. They also feature locking lugs that prevent the plug from rotating in the drill hole when installing. This makes the plugs a very secure and reliable fixing. · · · All purpose cost effective for Lightweight Duty applications · · Ideal for Concrete and Masonry · · Reliable two way expansion · · Plug Size 7mm x 40mm