Airplane groover cuts clean, smooth professional control joints every time. Made from the highest quality of cast aluminum with a broken-in face. Both the front and the back edge of the groover are curved up to avoid any gouging while in use. The tool creates a groove in wet cement to control expansion and contraction and relieve stress points. This 8" groover features a bit that has a 3/8" radius and is 3/4" deep and 7/8" wide. The single-piece formed groove provide a smooth professional finish. The closed end groover bit eliminates possible build up within the tool. The bit extends out both the front and back of the groove for easy back forth movement. The 12" wide blade is squared off to fit in corners and along forms. The tool accepts a 4-hole bracket of the user's choosing. The EZY-Tilt® II Bracket (#CC294) is recommended.