Monarch Machine Shop radius cutter tool holder – 2.393. I can’t explain why the label doesn’t say “Radius Tool” like other photos I’ve seen. The holding bar is 1.25″ by 9/16″ and shows a wear mark where it was secured. It holds 1/4 square cutting bits. It rotates freely although you can see some backlash in the video. On the rotating part you can see a gouge/cut. Feel free to ask questions, although I’m not a machinist.