The HST stencils allow you to make HST units that are both quick and accurate. The 1”, 1-1/2”, 2”. And 2-1/2” make 32 HST’s in only 15 minutes,and require no squaring up. Simply trim away the dog ears and you’re done. The stencils indicate the FINISHED SIZE of the unit after it is sewn in. Example: a 2” finished HST should measure 2-1/2” before it is sewn. Accuracy depends on carefully sewing ironing and cutting on the designated lines.