There are two dinky spot welds in line with the 3/8" blade that hold the blade to the larger piece that attaches to the "collar" or whatever you call it that attaches to the machine. When doing any sort of plunge cut (which this blade would seem to be designed for) the oscillation of the machine will shear off the spot welds. I sheared off two of these before I wised up. I sent one of these to Dremel with a letter explaining the shortcomings of their design and received a nice form letter and a new blade. If you want a 3/8" blade, you would be much better off taking a wider one and using a cut off wheel in your Dremel cutting it down to the width you want, making it look more like the Fein blade. Versatool makes a very good bi-metal blade that is a much better, much stronger blade than this Dremel blade. Dremel MM411 3/8-Inch Multi-Max Wood Blade
The 3/8 blade is perfect for when your working in a tight space and need precise control over the cut. It was the perfect blade for me to clean up and make a perfect (well, reasonably perfect) edge when I was replacing some wood floring. I made the main cuts with the regular size blade, but needed to clean out the corners and undercut the backside just a touch. I'm sure that a skilled carpenter could do that with the regular size blade, but since I don't fall into that category, the smaller blade was just the ticket to make the job a lot easier.
This is not a blade that you'd want to use for major cuts - other Dremel blades are more suited for that. This is intended for more limited, precision work in spots where the normal size blades won't fit comfortably. Also, it's a wood only blade -- you'll blunt it quickly on metal.
Most people will use their Dremel to cut out wood. This is Dremel's basic blade to do that. It is designed to only cut wood and if you hit metal it is history. Luckily, it is relatively inexpensive compared to other brand blades so you won't cry too much. I cut about 10 feet of exterior 3/4 play with it and it was fine nearly all the way to the end when it hit a screw. No blade of any sort really stands up to a hardened screw and 3/4 exterior ply with all of its blade-dulling glues is a tough test. So, not a bad blade. If it had not hit the screw, it would still be good. It felt sharp all the way. It is an obvious choice for a Dremel, but I believe it can fit some other brands and would be a good choice for them as well.
Note that in remodeling work it is common to hit imbedded nails. This blade, and all the others I am aware of, even the expensive Fein blades, are not capable of surviving a nail. This is absolutely not acceptable and strikes one as a way to sell more overpriced blades.
I received the Dremel Max as a gift as I had some difficult exterior molding repairs to do. The tool came with a 3/4" wood blade which worked like a dream. I was able to cut a straight edge when removing a section of the molding that was rotted (bottom of a garage door and basement entrance door). You have to keep a steady hand and keep the tool level when making the cut, but it is very doable for even a wood-working novice like myself. I felt the narrower 3/8" blade would come in handy on future projects. In-store video on this tool hit multiple types of jobs where I needed this tool. Definitely recommend.'
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