Trim Clip’s Miter Aid tool is designed to make trimming and picture framing a one man job. It holds both the tape measure and trim securely. Allowing you to precisely mark your cut and make accurate 45-degree cuts the first time! Simply mark 1/4-inch reveal lines using the built in reveal ledge. Nest measure the horizontal and vertical points. Make a left 45-degree cut. Transfer you measurement using Miter Air. Make a right 45-degree cut. Hang the trim and you are done! Illustrated instructions on package back.