Hello, This is a tool that I have used for years. It will cut an 1/8" Round-over, or, change the blades to a 45° Chamfer blade. Very handy for one-offs, or when I am out of the shop. This is one of the originals by L A Mathers, knockoffs are still available,sold by Rockler, Made in Taiwan. I still do round-overs & chamfers with a block plane, but this one sets up quickly and accurately. Regards, Lou