10PCS Long Carbide Burr Set 1/8" Shank Total L 4" Compatible with Dremel Die Grinder Bits Long 100MM HOMEIDOL 1/4" Head Tungsten Carbide Rotary Burr for Tight Area Woodworking, Steel Metal, Engraving

Works great just what I need

Bought the set for porting an aluminum intake manifold, and the bits all chew through aluminum efficiently. I can imagine they would be excellent for wood, resin, plastic, etc. Be careful when using not to bend the shafts- they're shipped in two seperate hard plastic cases for a reason! And if you are going to cut aluminum or other nonferrous metals, be aware of the speed and pressure you're using- consider using oil or another coolant to prevent galling and clogging of the teeth.

These are great for reaching into deep cavities. However, the long length prevents them from being run at high speeds without spinning off center or snapping. They are easy to use with stock dremel mandrels. Overall a good value, but more consideration should have been taken into the design for higher speeds. 10 pieces provides plenty of spares.

Over the course of my life I have found a variety of broken stone tools. Some have had beautiful workmanship but have been broken by use. I was looking for tools to turn these relics into pieces of art. I haven't used each of the bits yet but of the bits I have used all but one has held up to the grinding I have submitted it to. The large diameter bit has an area where the diamond has broken or worn off. However for the price I am very satisfied with my purchase.

Im happy with these they work great for carving soft stone

Worthless. They will bend and flop around the second they spin up. Absolute junk. Do not buy.

Did exactly what I wanted it for, fit in my dremel just fine. The little clip it comes with to hold them all is a nice touch as well. Found these on a youtube video and I have zero regrets buying them.

These work OK, but there is the touchy period right at startup and stop(down?) in a dremel tool, where the rotational speed coincides with their physical length (what's known as a resonance in physics) is no bueno and they can bend. Yes, *bend*. After that they are trash. I would recommend paying more for a name brand. Or be prepared to by more later on.