These are Replacement #11 Blades for the Tower Hobbies #1 Blade Handle (TOWR1010) and Deluxe Hobby Knife (RMXR6909). May be Used on Any Knife Handle that Uses a #11 Blade FEATURES: Interchangeable Surgically Sharp Blades Super-Sharp Point Provides a Fine Detail Cut INCLUDES: One Hundred #11 Hobby Blades COMMENTS: Hobby blades are extremely sharp Use with Caution and Wear Safety Goggles Do Not Bend the Blade as it can Break and Cause Injury ir/jl