Basic Quality Diamond and Economical Cutting Value! The Diamond Products #21163 7" x .095" Delux-Cut High Speed Continuous Diamond Blade is an economical blade for users who need to make occasional cuts in cured concrete.Basic quality and economical value Continuous rim for a smooth cut Offer a faster cut than segmented blades due to the serrated segment design, allowing less surface-to-surface contact General Purpose Cutting Diamond/Blade Quality Delux-Cut: Basic Quality Diamond/Economical Cutting Value Star Blue: Good Quality Diamond/Good Cutting Value Standard Gold: Better Quality Diamond/Better Cutting Value Imperial Purple: Better Quality Diamond/Very Good Cutting Value