From the maker

For safer rotary cutting with rulers measuring 10 inches and longer. ¿ -Transparent purple acrylic lets you read your ruler markings through the ruler handle -Ruler markings are clearly visible on both clear and yellow rulers -Mitered edges allow you to attach the ruler handles to corners of square rulers. -Clear adhesive dots included to attach the handles to your ruler. -You can see the ruler's markings through the adhesive and the ruler. -Adhesive is strong enough to allow you to pick up and reposition rulers using the handle. Purchase includes: -Two 9.8 inch transparent purple ruler handles -Eight clear adhesive dots to attach the handles to your rulers. (Two adhesive dots per ruler is plenty--you have extras just in case.)¿ Designed by Purple Hobbies LLC