After 30 seconds of use, it quickly became apparent that this bit is completely unsafe when used in a portable router. This would be fine on a CNC router, but it's too aggressive to control on a handheld router. Twitching and twitching uncontrollably. After ruining a project I had put hours into, I tried to save it by switching to the Amana bit, but I couldn't. I'm not new to template routing, I've completed several hundred projects over the years without these types of issues. Be very careful when using this bit in a portable router. Whiteside is usually a totally trusted source for cutting plotters and I own a lot of them. It's not one of their best efforts.