Ancon SPB Frame Cramp are used where a restraint is required between masonry and in-situ structures they can be fixed to concrete, steelwork or masonry and have a single 7 mm diameter hole or an 8 mm x 30 mm vertical slot.Ancon M6 Single Expansion bolts are recommended for fixing to concrete, set screws or self-drilling screws for steelwork, and suitable plugs and screws for fixing to masonry.