Contents: 1 x Double Airbrick Cover, 4 x Anchor Plugs, 4 x T Handle Screws, 4 x Anti Loss Washers, Tools Required To Assemble: Hammer, 7mm Masonary Bit, 4mm Parallel Pin Punch, Power Drill, BSI Kitemark licensed product (KM563624) passed the rigorous testing criteria of PAS 1188-1:2009, Available in single & double sizes, Fits any standard double air brick, Takes minutes to install after first application, Easy to deploy & compact to store, Used by Local Councils & the Environment Agency