Features and Benefits:?Easy size reference: Bit and blades are engraved for quick and easy size identification?Longer bit life: Replaceable blades are made of hardened steelKeep all the tools to change your SWITCHBLADE in this handy, self-contained storage case. The SWITCHBLADE replacement kit includes three replacement blades, one feed screw, two set screws, and an integrated hex wrench. 1-3/8 in. SWITCHBLADE 3 blade replacement kit come with: (3) 1-3/8 in. SWITCHBLADE Selfeed bit blades, (1) feed screw, (2) set screws, built in hex wrench with storage case.