Freud DS0612BW25 Diablo Demo Demon contains 5 Bi-Metal Nail Embedded Wood Reciprocating Blades. Freud DS0612BW5 are the most innovative blades on the market, delivering break-through 4x performance than standard blades. The unique feature combination of Ultra-Hardened Bi-Metal teeth, friction-reducing coating, and high performance Variable Tooth Design provides users with never-seen-before performance and ease of use.