These are replacement blades for the Dillon RT1500 case trimmer.
The blades are tungsten carbide (Grade C3/C4). They are PVD coated with TiB2.
The TiB2 coating is harder than TiN and TiAlN coatings and has an extremely smooth surface, resulting in reduced surface friction, speedy chip flow, and outstanding wear resistance.
These blades provide a superior cut on your brass, leaving little to no burring
requiring any further finish work.