The cutting spindle is effortless to clean and remove excess glue, wood chips, impurities, etc. from pipe, making the pipe cut smoother. It provides good square edges to the blank for a snug fit. Please make sure the cutting spindle is properly installed into the drill or lathe chuck. The guide shaft is suitable for mounting on drill chucks, lathe chucks, drill presses or hand drills and helps sharpen pens, grind holes and clean tiny inner tubes. The steel delivers clear cuts every time. The cutter shaft is made of high-speed steel, which is rust-proof, sturdy and , and has good cutting strength for maximum drilling. The sleeve adapter is made of brass. This kit provides convenience for your pen blank preparation process. The guide shaft diameters are 7mm (0.28inch), 8mm (0.32inch), 9.5mm (3/8inch), 10mm (0.39inch). The cutting head outer diameter is about 19mm (3/4inch), and inner diameter is about 6mm (0.24 inch). The O sleeve adapter allows the guide shaft to be mounted over 7mm, keeping it centered. Color:As Shown Material:Metal Package Contents: 1set * Pilot cutter shafts Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.