Are you using a Dremel mounted on a CNC stage or intending to use it by hand?
If the unit will be mounted to a CNC system you can use any of our tools up to a 1/16″ (0.0625″, 1.59 mm) cutting diameter. Larger diameter cutters will put too much of a load on the Dremel leading to overheating and eventual failure. If the Dremel will not be mounted to a CNC system, highly recommend the use of one of their attachments: cutting kits, router attachment, shaper/router table or a drill press attachment. If you will be using the tool by hand, stick to the larger tools (0.0625″ to 0.1250″, 1.59 mm to 3.18 mm) to minimize breakage. CAUTION: We have measured a number of Dremel grinders and have yet to find a unit with less than 0.006 in. ( 0.15mm) TIR. If you plan to use bits smaller than 0.0469 in. (1.20mm) you will need to replace the collet adapter with a more precise component.