Piping Hot Binding includes the following 3 items. Groovin' Piping Trimming Tool To create a perfect seam allowance on piping, simply lay the tool over sewn piping with the cording in the groove then cut along the tool's edge with a rotary cutter. Voila ... a perfect seam allowance. The tool is 11.5 in in length so it's possible to trim 400 in of piping in about 20 minutes! Two grooves are available offering 1/4 in and 1/2 in seam allowances Use with cording up to 1/8 in in diameter. Turn the ruler for use left-handed. Use any size rotary cutter.