Andis Blade Size: 40 Leaves Hair Inch: 1/100 " Leaves Hair mm: 0.25 mm Blade Description: Chrome plated, carbon-edged blade set for Andis detachable blade clippers. Used as a close cutting surgical blade for vets and for grooming poodles face, feet and tail for show. Can also be used with other brands of detachable type clippers.Andis' universal attachment combs (items #12990 and 12860) will fit this blade set.