This is the MK Diamond 45 Degree Bullnose Miter Guide and this is just what you need. This 45 degree bullnose miter guide attaches to your MK tile saw table allowing you to hold your tiles at a 45 degree angle to the floor so you can truncate the edge. This type of cut is used most often when a carpet butts up to a tile preventing someone from stubbing their toe when they hit the edge of the tile.