Jackoboard galvanised metal disc plugs for use when fixing Jackoboard construction board. Use 5no per m2. When fixing Jackoboard tilebacker boards to a brick or masonry wall, you’ll dot and dab them with a powdered cementitious tile adhesive, and then you’ll drill through them and hammer in this Jackoboard Metal Disc Plug Dowels. They split open upon entry, to ensure good anchorage. Available in lengths 50mm or 80mm. Dowel hole is Ø8mm.