The set is easy to set up and use. The first bit (#54310) shapes the face of the stock; cutting from each face completes the contour of the ball. Afterwards, a second bit (#54312) is used to shape the socket. A third bit in the set (#49498) is used to shape the end of the tambour which provides a place to mount a pull for opening the completed tambour. And, assembly is easy. Simply slide the slats together to create a beautiful flexible tambour thats perfect for creating your own roll top desk, breadbox, kitchen countertop storage areas and more, #54314, Unique 3-piece router bit set with antique solid brass knob, Shapes tambours that interlock with a ball-and-socket joint, Unlike ordinary tambours, there is no need for cloth, glue or wires, Each slat measures approximately 1/2" x 1", Minimum radius for the tambour door is 3-1/2", Max RPM 28, 000, 54314 3-Piece Carbide Tipped Tambour Door / Appliance Garage Door 1/2 Inch Shank Set U. S. Patent No. 7 810 532