The Trend Varijig Tendon and Grooving Jig allows grooves and tenons to be cut using a router. This routing assistance tool can be used to crosscut boards with a router or circular saw. The adjustable frame of this routing jig will allow narrower or wider grooves to be routed as well. The maximum adjustment for the grooves is 2-3/4 inches, depending on the diameter of the router base. The edge of the jig frame can be used as a guide to trim a panel square using a router. Two sliding stops in the jig template allow you to set groove length. The squaring butt on the carpentry jig has the facility to accept a speech block to allow a full-length groove. Fixing screws are included for this purpose. The working length on this tendon and grooving jig is 15-3/4 inches. Use with a router with a guide bush with a minimum 5/16-inch projection fitted. Router not included.