Grizzly   |  Model: H7789
Mortising Attachment Kit
Price: $122.44
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Grizzly H7789 - Mortising Attachment Kit

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This Mortising Attachment Kit, with its variety of interchangeable bushings, will fit just about any drill press for boring precision mortises. The entire kit includes cast iron chisel holder and fence, hold down assembly, quill alignment pin, 1/4", 5/16", 3/8" and 1/2" chisels, 3 two-piece bushings, 3 split bushings and carrying case. Just match your drill press quill diameter to the nearest ID bushing dimension. Not recommended for use with "baby" drill presses.

Bushing sizes include: 2.945" O.D. x 2.600" I.D., 2.600" O.D. x 2.366" I.D, 2.366" O.D. x 2.170" I.D., 2.600" O.D. x 2.000" I.D., 2.600" O.D. x 1.880" I.D. and 2.600" O.D. x 1.570" I.D.

Works with the following drill presses:

  • Grizzly G0485
  • Grizzly G0491
  • Grizzly G0794
  • Grizzly G7943
  • Grizzly G7944
  • Grizzly G7947 (with additional purchase of G9716 quill collar)
  • Grizzly G7948 (with additional purchase of G9716 quill collar)
  • Shop Fox W1680
  • Sears 21313
  • Sears 21315
  • Sears 21317
  • Delta 11-990
  • Delta 14-070
  • Delta 17-900
  • Delta 11-090
  • Jet JDP-14MF
  • Jet JDP-17M
  • Jet JDP-17MF
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16 Customer Reviews (4.9 out of 5 stars): Sign in to write a review


No I am not happy with the H7789 mortising attachment kit. First of all, the G7943 drill press was listed that the attachment would fit. Well it does not work on the G7943 so I returned it and you refunded 77 dollars and some cents. I paid all most 95 dollars plus shipping. So the total price was over 110 dollars. Since you listed the G7943 to work with this kit, I feel that you should pay for the return shipping and not charge a restocking fee. I called and complained about this and was lead to believe that you would take care of this. But when all was said and done you charged me return shipping and a restocking fee.
All I can say is that if this is the way you are going to treat your customers, and that if you are not going to pay for the return shipping and not charge a restocking fee then you can count on the fact that I am not a valued customer any more. I would not have ordered the mortising kit had the G7943 not been listed. Levi Bontrager



This is the first time I had ordered from Grizzly. The mortising attachment fit my drill press perfectly. A nice addition to the shop.


This tool fit my Grizzly drill press with only one problem. The small steel blocks that are used to hold down the cast iron fence were slightly too thick and required a slight grinding to allow the clamps to hold the fence tight on the table. After this small modification the tool worked well. This is a resonable tool to invest in if you do not need to do alot of mortising for production. I used it to mortise a stack of birch plywood and it did a very good job with almost no tear out on the bottom lamination. I would suggest sharpening the drill bit slightly under magnifycation to provide cleaner cutting. The chisel portion of the bit is slightly tapered which allows backing out the bit to clear chips.The kit is well designed and a good value.

So Far So Good! 1/28/2018

I set it up on my Rigid Drill Press and practiced with it. I haven't completed a project but it appears to be up for the task.

Worked great on my first project! 11/9/2017

Bought this to make mortise joints on a bed project and it worked great! Bed is already being used by our son.

limited 9/29/2017

This product does not fit "just about any drill press" as stated. Do not buy this unless you have one of the drill presses listed.

Mortised child's bank 8/23/2017

With limited instructions it was. Easy to install and use. Not a lot of time wasted putting it on and off drill press. Instruction were better than others but was lacking. I have a jet which it handles but nothing written that made it easy. Overall works great

Phillip H

I bought this about 2 month ago and have used it twice and the product works great. I took a few tries to get it setup the first time, but after I figured it out it work great. It is imporant to keep the tip of the drill bit oiled so it does not over heat.


This mortising attachment kit did the job I had to do but I have to say it is a low quality version of what it can be.
Certainly not the best.

Leon S
Mortising jig 6/1/2017

I've been very happy with the unit overall, but I am having a great deal of difficulty with the 3/4" drill and/or mortising bit. They seem to overheat, no matter how often I withdraw and reinsert the drill.. The smaller bits presented no such problem.

Chris M
Drill press is awesome and very well made 5/4/2017

Bought this a month ago and have loved drilling and using the mortis attachment. Great product.

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