I have 10 of these blades, all brand new. I am told they are Irwin blades without the markings. 1" arbor, 1/8" kerf. These are 80 tooth and 105 tooth blades, $120 to $190 each normal pricing. I am selling them for $75ea, $49ea if you buy them all. I used these with the Dewalt DW872 chop saw, which is sold. I-10 and Chandler Blvd