Premium Texture: The cutter shaft is constructed from high-speed steel, which is rust-resistant, strong, and robust, with good cutting strength for maximum drilling performance. The sleeve adapter is crafted from brass. The pen trimmer kit provides a practical and convenient tool for preparing pen blanks. Blank Edge Creation: Designed to create square edges on blanks, ensuring a snug fit between the blank and the corresponding part for improved accuracy and assembly. Easy to Use: The cutting shaft helps clean and flatten the inside of the pipe by removing excess glue, wood chips, and other debris. The shaft must be securely fitted into a drill or lathe chuck during use. Size Information: Pilot shafts included in diameters of 6 mm (0.24 inch), 7 mm (0.28 inch), 8 mm (0.32 inch), and 9 mm (0.36 inch). The cutting head measures approximately 19 mm (3/4 inch) in external diameter and 6 mm (0.24 inch) in internal diameter. The O-style sleeve adapter fits pilot shafts over 7 mm to maintain center alignment. Versatile: The guide shaft is compatible with drill chucks, lathe chucks, drilling machines, and hand drills. It can be used for sharpening pens, grinding holes, and cleaning small inner tubes. Color: Silver Material: High Carbon Steel Package Contents: 1 set x Pen Making Kit Note: Light reflection and different display settings may cause slight variations in the color shown in the image compared to the actual product. Measurement may vary by +/- 1-3 cm.