These patch boxes are made from .050 thick stock with nicely rolled hinges. With die cut boxes, a maker with a stock profiling machine can make one set-up, and all the same style boxes will fit the cut-out. Each box contains a high quality spring and screw lid operation; the pawl is already installed. Box is curved to fit the stock contour. For the builder who may want a special patch box or would like to cut and shape to his liking. The hard part is already finished.