The new Router Table Box Joint Jig from Rockler, $119.99, looks easy to use. Once it’s secured on your router table (the table must have a 3/4″ miter slot), an aluminum index key is used for positioning. The right angle backer acts like a miter gauge to guide the material past the router bit. The jig can be used to cut 1/4″, 3/8″, and 1/2″ finger joints. The index keys for all three sizes are included with the jig. It would be best to secure your sacrificial board to the right angle backer. The backer is predrilled for this purpose.
The Router Table Box Joint Jig works with material up to 3/4″ thick. Rockler recommends using upcut spiral bits for the joints, available from Rockler for $16 to $23 each.
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Rockler Woodworking and Hardware
(800) 279-4441
I like to use box Joints over dovetails.
At the demo two weeks ago, they were having problems with the new slots sliding over metal bar. Turn out the up cut spiral bit was slightly less the .25″…other Rockler spiral bits were the same. Might try a Freud bit.
Is it possible to to buy the “Rockler Box Joint Jig” as metric system
I am not aware of this option, but you might want to contact them directly at http://www.rockler.com/ to receive a definitive response on this.