another along and extend inwardly from the respective top edge 12 and the side edge 14 of the base 11 the guide angles 16 and 17 have effacing ends 16 a and 17 a which are in spaced angular orientation to one another forming a cutting gap at 18 therebetween that aligns with the primary diagonal line d illustrated by a line indicia positioned on the base 11 and a secondary parallel line d u2032 for aligning to mark u00bc inch from the edge of fabrics as will be described in greater detail hereinafter a right angle triangular transparent guide panel 19 is hinged along one side to the perimeter guide angle 16 by a selective hinge configuration 20 a lifting tab 21 is formed integrally with and extends from a free side edge surface 22 adjacent the panel 39 s defined angular edge cutting surface 23 the hinged configuration 20 may be of any continuous piano type or multiple spaced hinged elements so as to assure edge orientation when selectively operated from a first flat base engagement position to an upstanding position as seen in solid and broken lines in fig1 of the drawings it will be seen that the cutting guide edge surface 23 of the hinged triangular guide transparent guide panel 19 defines a u201c true u201d diagonal across a surface s of the support base 11 and is correspondingly in alignment between the.