Parallel slots for precision markings from 1/4 inch to 3-3/8 inch Measure and mark exact location of buttons, buttonholes, pockets, etc. Measure straight of grain from fabric selvages Measure and mark spacing for pleats and tucks Mark guide lines for decorative stitching Use to guide tracing wheel and pencil markings; Simplify pattern alterations Measure and mark bias strips, Manufacturer: Yi Concept