Dremel 678 - Circle Cutter and Straight Edge Guide Rotary Tool Attachment - Fits Dremel Models 4300, 4000, 3000 and 8220

Easy of use with the dremel. Good design

I am so thankful I finally found one of these Dremel accessory attachments circle cutters I have been needing something like this for so long I did not want to spend an arm and a leg to buy a router and in my artwork I am constantly needing to cut circles either out of the center of a piece of wood or cutting an outer circle into a piece of wood I have three different dremels and I thought surely this thing will fit on one of them I was a little concerned about the sturdiness of the wood cutting bit that came with it because I was cutting through an half inch piece of plywood however after I set it up and started my pilot holes and started cutting into the circle of wood it went smoothly the bit held up great and I cut a perfect circle out of the center of my wood I even turned around and tried it on a plastic decorative plate and it worked great on there so I would highly highly recommend this accessory if you are needing to cut circles and you don't want to spend an arm and a leg on a humongous expensive router this definitely worked I even bought a couple of extra wood cutting drill bits for my Dremel which is always good to have on hand because you never know when you'll break one but overall this was a great great buy for an excellent price

Jig worked great for the project I purchased it fop. The bit felt cheap when I opened the box and sure enough, it broke its first time out.

Using this circle cutter with straight edge guide is a great way to turn your dremel into an even more valuable power tool. The circle cutter has worked flawlessly cutting very clean and quick circles/holes. The alternative is to purchase very expensive hole saws that require a major drill for the larger and deeper holes. The dremel and spiral saw bit will allow you to cut very large holes quickly. Set up is a snap and the center point adjustment is super easy to set without any special tools. The hole sizing gauge is a bit general, but if you need a precisely sized hole, I use a tape measure to set the radius by measuring from the far side of the spiral bit to the center of the pivot point. The straight edge guide turns your dremel into a small router that you can use to do all sorts of helpful cuts. Often, whenever I am away from my router table, this is my go to tool for cutting a small and simple dado or rabbit, or cleaning up an edge. I love this attachment!

This is my second time purchasing this tool because I misplaced the first one. I used this to cut out round speaker holes for both HDF boards and ceiling boards. Of course HDF board take longer time to cut and after a couple of wholes (6" diameter) the cutting drill bit became somewhat dull. Cutting the ceiling boards is like cutting butter with a sharp knife, very easy and accurate cuts. It takes a little practice to figure out how to setup the position of the drill bit to a precise cut, but once you figured it out, it's pretty easy to setup. I recommend this tool.

Take your time and you will create great circles with this product.

Got a used product that was missing some of the hardware, which made me have to find a bolt to attach the slide part and the bottom.Works ok. Super jittery. I'm not sure if it's because someone messed it up and returned it or because that's just how it's designed.I don't know.Amazon. Stop sending it old, used stuff to people or if it's opened at least do some quality control

I used this to cut out holes for the subwoofers in my subwoofer box. It worked pretty well, but not perfect. Results were somewhere in-between a jigsaw and a router. I drilled a pilot hole for the center pivot piece as well as the cutting bit so I didn't have to ease it in at an angle or anything funny like that. With MDF it could take off 3/8" of material at a time, but I had to max the RPM on the Dremel which I normally don't like doing. The bit seemed to like cutting clockwise better than counter-clockwise (perhaps that's in the instructions I threw out, I don't know). The first pass took longer than the second.Make sure you have the circle you're cutting supported separately but at the same height as the main piece you're cutting from, otherwise when you get to the end of the cut it'll start dropping and you'll become inaccurate.Overall I would plan on making your cuts slightly larger or smaller (depending on if you're using the inside or outside of what you cut) and sanding it a bit to even it out. If you really want a PERFECT circle this probably isn't enough, at least for thicker materials or thicker/quicker cuts. But a proper router is incredibly expensive in comparison, especially if you already have the Dremel anyway and just have to buy this attachment. For one-offs it's fine, but if you plan on using this daily you have the wrong tool.