Browning Serpintines were actually only a two blade. Each blade turned into a narrow ribbon which twisted to the rear of the ferrule. The Spiral Killer is indeed a three blade, much like an MA-3 except the blades have a helical twist. Spiral Killer broadheads were a division of Miller Ski Co., Oram, Utah. You know they were made a long time ago, they sold for under $6.00 a dozen. Bow'narrow