This listing is for the Bias Square-Plus ruler by Nancy J. Martin and Marsha McCloskey. The all-time favorite ruler for rotary cutting half-square triangle squares from bias strip sets or for truing up oversized sewn half-square triangle units. The Bias Square-Plus ruler is 8-1/2 square, has lines for the 1/8th dimensions, and markings at the edges and down the bias line for 1/16ths. A light dashed line marks the 1/4” seam allowance on the leading edge of the ruler.

This method of cutting HST units from bias strip sets is described in Marsha McCloskey's books on making Feathered Stars.