This laser cut acrylic ruler is great for accurate cutting of the narrow strips that are used for making bias strips to be used in the bias tape makers! It will work for either right or left handed people. By using the slot in the middle for your rotary cutter, to enable you to cut fabric strips accurately and exactly parallel. Since the fabric is held more securely and completely underneath the ruler it prevents the fabric from rippling, which ruins a straight cut and wastes time and fabric. Your cuts are straight without curving or slipping! A must have for anyone who sews or quilts! Quickly make bias strips or add seam allowances Use with rotary cutter and mat. Easy to read numbers Guides for bias (45 degree angle) Convenient 1/4" increments marked on each side of the rotary blade slot Translucent green color works well with any shade of fabric Laser cut acrylic ruler measures 4" x 16".