Package Content Set of 4 Bias device 6mm, 12mm, 18mm and 25mm, good quality, strong and dural, which is better to sew it on. Avandage The seam bias is to facilitate your sewing, for the fabric is stretchy and works more easily when sewing curves and angles. Wide Application With this stitching bias accessory, which allows you to place your rounded bias tape without the fabric wrinkling, suitable for making a fabric glue bracelet, and other DIY project. Material This bias binding is made of high quality plastic material, ergonomic design, no damage to your hand. How to use Here is how to use it and for details, please see picture 2.1. Fold the top of the fabric strip 45 and pass through the bias devices. Use an awl to help pass. 2. Extract the fabric strip, keeping both sides of the fabric strip symmetrical, then iron it with an iron.