The Irwin Tools 1811865 Marples 8-Inch Stack Dado Blade is part of a full line of fine woodworking saw blades that are manufactured in Italy to the highest standards of precision required for fine woodworking and finish carpentry. These industry-leading laser-cut, thin kerf saw blades are produced in a highly-automated, state-of-the-art facility in Udine, Italy - the heart of high-quality circular saw blade manufacturing. Engineered with oversized, high-quality carbide, the new Marples Woodworking Series saw blades provide the extended life and flawless finish professional woodworkers and finish carpenters demand. The blades are precision tensioned for flawless cuts. They also feature a heat resistant, non-stick coating that has an Aluminum Matrix added to it to dissipate heat for easy clean up and truer, cleaner cuts. The Stack Dado set has an 8-Inch Diameter with 12 teat and features resharpenable oversized carbide teeth. The Stack Dado cuts grooves from 1/4-Inch to 7/8-Inch in diameter. The dado is great for use in softwood, hard woods, plywood and melamine. The set includes 2 outer blades, 3 chippers,3 spacers and 7 shims ranging from 0.1 to 0.5mm or .004 to .02.