Squedge 15 Ruler by Phillips Fiber Art
Wedges make circles, but Squedges make squares.
The 15 Squedge makes a 16" finished square (16 1/2" unfinished) with 24 Squedge pieces.
Use the precise slots for marking the inner shorter pieces.
Open the packaging and you have another Bonus pattern, a terrific lap quilt, 45" x 45".
It too is stash friendly!