8" x 8" square end, 3/4" bit depth, 7/8" bit width, and 3/8" radius double bit airplane groover made of high-quality cast aluminum blade only. By jointing concrete with the airplane groover, you are giving the concrete a place to settle without leaving cracks through your concrete slab. Unless you will be cutting your joints later with a walk behind saw it can be finished with this groover when you are finishing a fresh slab. Use with 4-hole bracket, not included. Handle not included. See our extension handles, handle adapters, and handle brackets.