Carpenter square

A woodworking square comprising a planar body member having a straight aligning edge, a guide means associated with said straight aligning edge and extending perpendicularly from said planar body and positioned to be colinear with said aligning edge, a straight first scribing edge perpendicular to said aligning edge and a second straight scribing edge disposed between said first scribing edge and said aligning edge and said first edge, and wherein said second scribing edge intersects the junction point of said aligning edge and said scribing edge and wherein said planar body member includes a number of small apertures passing there through and said square includes a pin means sized to snuggly pass through any of said apertures and orientate said square in a particular manner relative to a straight edge of a piece of material in contact with said pin means and a reference point on said guide means.