This is my third order for Speed Tiger. I needed to drill a .078" slot in cast iron, so I ordered 5 sets of 1/16" end mills because I was sure I'd break one or two before I was done. I thought I could feel the end of the groove when I hit it, but I almost ruined the piece because the router cut so freely. I'm a hobby machinist so I don't have high speed CNC or an inordinate amount of work, but I've been a hobby machinist for over 30 years so I've had the opportunity to try many different routers. I have used both Speed Tiger roughing and finishing cutters and have been very happy with both. They also come in clear sleeves, making them easy to identify among the stack of cutting tools in my tool chest. the cost is also very reasonable.