5-degree internal brackets are used with the F150 Box glazing bar. This aluminium bracket attaches to the support structure or wall and the glazing bar sleeves over the bracket. The glazing box-bar is fixed in position using the 4x S/S self drilling tek-screws (included). The standard bracket is set at 5-degrees but other angles are available. Becasue this bracket is concealed inside the F150 Box bar powdercoat finish is not required.