The Bosch Edge Blades have several advanced features making them one of the fastest, longest lasting and lowest cost/cut reciprocating saw blade on the market. Some of the features that make the Bosch Edge blade different are the alternating 2x2 TPI configuration that help improve speed when cutting Metal. The Micro-Blast tooth treatment cuts a more precision edge which keeps teeth sharper longer. Power metal steel allows for increased heat resistance which also helps extent the life of the blade. Together these new innovations make the Bosch Edge one of the best recip blades for cutting Metal period.