With the EasyCoper and an ordinary jig saw it's possible for anyone to produce those professional looking, almost seamless, coped intersections of crown moldings. It perfectly aligns the saw blade to produce an exact back cut, eliminating the excessive time and effort needed to shape it with other tools. Designed by a professional carpenter, the patented EasyCoper has been tested and proven to save time. Handles moldings up to 5-1/2" wide. System includes both a left hand and right hand unit. USA