The 3/8 radius ensures that the grooves are deep enough for a 7/8" groove width.
Concrete Groover,Bronze/Wood,3/8 Radius The Kraft Tool CF304 Concrete Groover is the versatile tool you need for creating decorative patterns on your next project. This Kraft Tool CF304 Concrete Groover is the perfect tool for creating decorative grooves in concrete. It has a 4 1/2" width, which means it can be used to create large grooves in your concrete projects.