Trim Clip Miter Aid 003010 Measuring Device 100% Poly Carbonate Imported Securely Holds Tape End for Accurate and Easy Measurements for Miter Cuts No need for helper to measure Accurate Measurement first and every time Integral spring clamp holds the Miter Aid in place-excellent for long trim pieces Built-in reveal fence allows you to quickly mark 1/4&#034; reveals on all four corners Lightweight, durable construction Bright yellow color makes it easy to find on the job site Designed for 45 miters only