Bloc_Loc Half Square Triangle Ruler 8.5"
Has the Bloc Loc patented technology channel machined for accuracy underneath 1/8" clear acrylic which locks the seam allowance in place and allows the quilter to square up a half-square triangle block in just seconds with ultimate accuracy and safety. No turntable is necessary, just turn the ruler and your fabric moves with Bloc Loc!!! No more "ruler rock" or slipping guaranteed!! Bloc Loc rulers have easy to read solid markings throughout every 1/2" and perimeter markings to 1/8".