Bosch OSC314T 3-1/4-inch TiN BIM Segment Saw Blade 12 Pin design provides a secure connection for high-torque oscillating tools (tools not included) Tin Coated BiM Design provides up to 30% longer life over the standard BiM in metal cutting Patented BiM manufacturing - only manufacturer that can weld HSS onto HCS in a circular design; others can only weld in a straight and linear fashion