The Trim-A-Tip trims off the excess fabric tips when using templates or using quick rotary cutting method. Each corner has a different angle; 30,45,60, and 671/2 degrees. Trimming off the tips makes for easy, accurate, and fast piecing. Piece a huge variety of angled designs. For more instructions check out the tutorial on "How to use Trim-A-Tip with Templates and Rotary Cutting".