Fangrui Product Details Premium Texture: The Cutter Shaft Is Constructed From High Speed Steel, Which Is Rust , Strong And Robust, With Good Cutting Strength For Maximum Drilling. The Sleeve Adapter Is Crafted From Brass. The Pen Trimmer Kit Provides A Practical And Convenient Tool For Preparing Pen Blanks Blank Edge Creation: The Function Is To Create Square Edges For Blanks And To Create Ideal Edges To A Snug Fit Between The Blank And The Corresponding Part, Guaranteeing A Good Fit Easy To Use: The Cutting Shaft Is Used To Clean And Clean The Pipe To Make The Pipe Cut Flatter By Removing Any Excess Glue, Wood Chips, Etc. The Cutting Shaft Must Be Correctly Fitted Into The Drill Or Lathe Chuck During Handling Size Information: Pilot Shafts Contain The Sizes Of 6 Mm (0.24 Inch), 7 Mm (0.28 Inch), 8 Mm (0.32 Inch), 9 Mm (0.36 Inch) In Diameter; The Cutting Head Measures About 19 Mm (3/4 Inch) In External Diameter And 6 Mm (0.24 Inch) In Inner Diameter, And The O Style Sleeve Adapter Fits Pilot Shaft Over 7 Mm To Keep It In The C