Most corners aren?t perfectly square and getting mitered cuts to fit tightly can become a nightmare! The BORA Angle Master Angle Finder /Miter Saw Cutting Angle Set Up Tool takes the guesswork out of angle duplication and eliminates the frustration of setting the proper angles on miter saws when making angled miter cuts. The Sliding Angle Duplicator Gauge accurately duplicates inside and outside angles, locks into exact position and splits in half for the perfect miter saw angle set up guide. No more wasted cuts and trim boards that become too short from multiple ?guess cuts?. This Angle Finder /Miter Saw Cutting Angle Set Up Tool is ideal for installing trim work, moulding/casings, building furniture, framing pictures, installing tile, etc. Whether you are a beginner, an experienced do-it-yourselfer or a professional, this is the perfect tool for perfect results while saving time and money.