The Kreg Tool KLTJ100 MortiseMate Loose Tenon Jig w/ 6mm Cutter is built for woodworkers who want strong, accurate mortise and tenon joinery without stepping up to a dedicated mortising machine or router-based system. This is a loose tenon jig designed for cutting mortises with a drill. Model Number: KLTJ100. If you build cabinets, furniture, face frames, panels, or clean 90-degree joints, this jig gives you a practical way to make hidden joints with repeatable results.

The big story here is simplicity. Kreg designed the MortiseMate to cut mortises with just a drill, which lowers the learning curve and cuts down on setup compared to more involved joinery methods. The auto-indexing step-down mechanism lowers the cutter tip in 1/16 inch increments on each pass, so material comes out in controlled stages instead of forcing a deep cut all at once. In real use, that means easier control, a cleaner process, and more consistent mortise depth when you are making multiple joints for the same project.

Another feature that matters more than it sounds on paper is the micro adjustment system. Mortise fit is everything in loose tenon joinery. Too loose and the joint loses accuracy. Too tight and assembly turns into a fight. The MortiseMate gives you micro adjustment screws so you can customize mortise width for the fit your stock, tenons, and glue-up actually need. That is the kind of detail that saves time at assembly, especially when you are working with hardwoods or trying to keep a panel or frame perfectly aligned.

Kreg also built in a mini work surface to speed up setup for panels and 90-degree joints. That matters because good joinery is not just about the cutter. It is also about keeping the work supported and clamped consistently. The integrated work surface helps with fast positioning and secure clamping, making the jig more useful both in a fixed shop setup and when you need to move it around the bench. For small-batch furniture work or one-off custom jobs, that kind of flexibility is a real plus.

The included carbide-tipped 6 mm mortising cutter gets you started right away, and laser-etched markings on the cutter make stop collar positioning faster for common mortise depths. If your joinery needs change, the system also supports 8 mm and 10 mm cutters, so the jig can grow with the type of work you do. That gives the Kreg platform some staying power, especially for woodworkers who move between lighter frame work and heavier stock where a larger loose tenon makes more sense.

In day-to-day shop use, the practical range is solid. The jig fits workpieces from 1/2 inch to 1-1/2 inches thick, which covers a lot of common furniture and cabinet material. A dust collection adapter is included, which is a smart add for visibility and cleanup when you are making repeated cuts. At 5.88 pounds assembled, it has enough heft to feel planted, but it is still manageable enough to move around the bench when the job calls for it.

This Kreg mortise and tenon joinery tool makes the most sense for serious DIYers, cabinet builders, furniture makers, and trim carpenters who want stronger alignment and cleaner hidden joints than basic pocket-hole construction can provide. If you want an easier entry into loose tenon joinery, the Kreg Tool KLTJ100 MortiseMate Loose Tenon Jig w/ 6mm Cutter is the kind of tool that removes a lot of the usual friction and gets you to accurate results faster.

Kreg Tool KLTJ100 MortiseMate Loose Tenon Jig w/ 6mm Cutter Makes Loose Tenon Joinery Way Less Intimidating

This is a smart buy for woodworkers who want the strength and alignment of loose tenon joinery without jumping straight into a bigger, more expensive dedicated setup.

• Who it's for: Furniture builders, cabinet guys, and serious hobbyists who want stronger hidden joints and better alignment than simpler joinery methods provide.
• Why it stands out: The drill-powered design, 1/16 inch auto step-down action, and micro width adjustment all work together to make accurate mortises easier to repeat.
• Worth knowing: You get the 6 mm cutter in the box, but if you plan to work across a wider range of stock and tenon sizes, budget for the 8 mm and 10 mm cutters too.

• What type of tool is this? This is a loose tenon jig for cutting mortises with a drill.
• What stock thickness will it handle? It fits workpieces from 1/2 inch to 1-1/2 inches thick.
• What cutter size comes with it? It includes a carbide-tipped 6 mm mortising cutter with a stop collar.
• Are other cutter sizes available? Yes. 8 mm and 10 mm cutters are available separately.