The E-Z Pro Crown King (880) from General Tools & Instruments is ready for use right out of the box — no assembly required. It’s composed of two pieces: the jig itself and an insert/adapter. Without the insert, the jig is positioned for cutting 45-degree spring angle moldings. With the insert, it quickly reconfigures to accommodate 38- or 52-degree spring angles. To use the Crown King, you measure the corner angle, divide it by half, set your miter saw to that angle, cut and fit. The E-Z Pro Crown King is priced at $29.99.