This Jig Plate is made for installing the Futures Strong Boxes but also can be used to install other center finboxes. The plate has adjustable guides to fit most router base plates and accommodate most center fin boxes (Bahne etc...). A plunge router should be used when cutting the hole. Start with small passes over the stringer then plunge to full depth. The Futures "One Pass" Strong Box Bit is sold separately. Jig plate is made of aluminum with non-slip rubber mat on the bottom to keep it from moving during routing. Made in the USA.