One MK Diamond, MK-297 series, Criterion, 24" (610mm) blade, part #109207. Listed retail for $586.00 before a 20% DISCOUNT IS GIVEN AT THE SHOPPING CART. The Criterion is a premium grade, notched rim blade for lapidary materials. Blade: diameter 24" (610mm), width .105, arbor 1". MK Diamond is celebrating their 50th year in business. FOB Torrance, CA. or Powell, WY. Made in the U.S.A.