See it in action:

Leigh FMT Pro Frame Mortise and Tenon Jig

Item #: 25004

Cut indestructible mortise and tenon joints with absolute precision. Can create tiny tenons less than 1/4" wide—you have to see it to believe it.

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$1,079.00

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Overview

If you can use a plunge router, you can cut strong, perfectly fitting mortise and tenon joints in no time. Easily rout single, double, twin, quadruple or even triple mortise and tenon joints, plus angled and compound-angled joints, in stock up to 3" x 5". Virtually any plunge router will fit and still be available in seconds for other uses.

Nothing provides matching joint halves with the ease and accuracy of the new Leigh FMT! Named one of Workbench Magazine's Top 10 Innovative Tools of 2004, the FMT Jig allows you to rout both parts of the joint with just one joint guide, one router bit and one jig setup. Make perfect joints for everything from match-stick frames and miniature tables (rout joints smaller than 1/4" - so tiny they're almost beyond belief!) to full-size chairs and 6-foot garden gates.

Features:

It's remarkably easy to set up perfectly aligned multiple mortises and tenons on the FMT. Precision and repeatability are made possible by adjustable table limit stops that control the table's range of motion in both X and Y axes.
With each mortise or tenon position sighted and limit stops set, you're ready to rout double, quadruple, or even triple joints with the same ease and precision as a single mortise and tenon.
Joint tightness is infinitely adjustable by simply turning a calibrated knob; the fit is recordable and repeatable.
Sliding cursor provides easy alignment.
Bolts to a board and clamps to a bench.
No dedicated router is required!
Comes with universal sub-base that attaches to virtually all plunge routers, five 5/16" guides that will make over 20 sizes of mortise and tenon, guide stand, 5/16" spiral upcut cutter with 1/2" shank, two cam-action Speed-Clamps, outrigger bars, adjustable sidestop fence, fully illustrated user guide, screwdrivers, and mounting hardware.
The ACMTC Accessory Kit (#39770 - Sold Separately) includes eight 1/4" guides, four 3/8" guides, four 1/2" guides, eight-piece solid carbide spiral upcut bit set, and wood storage box.