a result of an overall height of approximately 2 u215c inches accordingly a tread of commercially available 1 u00bd inch thick lumber will be fully covered by the nosing member the abutting seam between the nosing member and the strip 24 along the lengthwise edge of the panel is co planar with the remainder of the rear surface 34 projecting downwardly beyond the bottom side of the panel so that the overall thickness of u00be inch of the nosing member along with the rear flat surface thereof permits the opposing front surface 38 to be easily routered prior to assembly of the nosing member onto the panel in addition to adhesive which secures the nosing member onto the panel a castle drill is used to form two sloped bores 40 projecting from the bottom side 36 of the panel near the lengthwise edge 30 to which the nosing is attached the bores 40 extend at an upward and forward incline towards the nosing member 28 and has a sufficient depth that a screw 42 received therein is fully hidden flush with the bottom surface of the panel so that nothing projects past the bottom side and interferes with mounting of the bottom side on the top side of the existing tread the internal end of the bore 40 is spaced inwardly from the lengthwise edge 30 mounting the nosing member thereon such that when the screw is received in the bore the screw overlaps a portion of the last strip 24 of the panel as well as the nosing member into which it projects to ensure a firm grip across the seam therebetween the screws 42 are inserted through the bores.