45 degree Double-Strip Kaleidoscope Ruler
The 45 degree Kaleidoscope Double-Strip Ruler is one of a range of Double-Strip Rulers that are designed to make cutting Half-Square Triangles, Quarter-Square Triangles, 60 degree Triangle, and 45 degree Kaleidoscope Triangles from pairs of 2.5' Strips sewn together to form a 4.5' strip set.