Ruler sizes: 2.5" square, 4.5" square and 6.5" square
Square up a half-square triangle in less than half the time. No more ruler rock with Bloc_Loc. The patent pending channel locks onto the seam and slides to make a perfect square cut every time. All Bloc_Loc Half-Square Triangle Square Up Rulers have fine, solid lines every .5" which makes trimming more accurate.