Here Is The Dado Blade Everyone Has Asked For! For Undersized 1/4” Plywood and Melamine Dado Cuts Makes a PERFECT 5.7 mm wide groove - the same width as undersized Plywood and Melamine. Makes PERFECT Flat Bottom Grooves. Make the right groove in one pass for metric Plywood and Melamine. The Quarter-Master undersized is available: 8” x 24 teeth x 5.7 mm kerf x 5/8” bore.