The easiest flying geese squaring up ruler I have ever used.  Lock your flying geese seams in the underside groove of the ruler and your ruler won't twist or wobble, making it easier to square and trim! The Flying Geese ruler will also square up a Diamond in a Square unit.
Ruler is  2.5" x 4.5" (2" x 4" finished in a quilt)

Bloc Loc's patented technology of flying geese rulers make the tough job of squaring up easy and fast. The groove slides along the seam to trim smaller units and allows quilters to rotate the block without lifting the ruler. 

Instructions included. Watch the video for a demonstration.