I use these with an old Dremel router as a makeshift router table for free-riding cutouts in 1/8" thick tinted polycarbonate sheets that I use as bezels on weather stations. This material is difficult for me to work with as it chips and tears easily. They cut through this material, well, not like butter, but fairly smoothly. I ran them at the slowest speed on the dremel and had to reduce the feed speed or the chips came off so hot they melted. I am very happy with these beats. My Dremel is at least 20 years old and the bearings have been removed so the shaft can wobble when using the cutters. It was easy to control with them because they are spiralizers, not hanging around. Even a new Dremel tool is likely to jingle with the bits in this plastic router bit assembly.