later As a total router lover I've had a hard time choosing the right bit. There were many cheaper attachments out there, but I wanted something that would last for multiple projects. We used this bit to round the edges of the 2x4 and 4x4 (covered in yellow). Remained clear and true throughout the project. Was a good weight and was a well built item. The beat worked just as well at the end of our project as it did at the beginning. I debated whether this radius was correct for the 2x we were using. I didn't want the edges to be completely round, but I wanted a falling child to have less of a chance of splitting their own head. It was the right choice and a good ending to our project.