Diall Steel Hollow Wall Anchor Pack of 4. This pack of four steel hollow wall anchors from Diall are designed for use on plasterboard hardboard plywood & chipboard & internal use. ideal for shelves & bathroom accesories radiators & kitchen cabinets pictures lamps electric switches towel rails curtain rails coat hooks on hollow doors standard double thicknes & tiled plasterboard hardboard plywood & chipboard. They're extremely durable & can be used on internal locations.