Flying Geese set 3 contains two Bloc Loc rulers. Finished size of flying geese blocks are 2" x 4", and 3" x 6". The groove in the Bloc Loc rulers helps you position your ruler to trim blocks more quickly and accurately. It totally eliminates ruler rock and the end result it perfect flying geese blocks! All Bloc Loc Flying Geese Rulers are sold by "finished size" meaning the ruler is physically 1/2" bigger than the size listed. The rulers will trim units to the "finished size" plus a quarter inch seam allowance on each side. Bloc Loc Flying Geese Rulers are size specific and will work to trim one singular size of flying geese (the size listed). The Flying Geese Rulers can also be used to trim Square in a Square blocks the size of the ruler or smaller.