Various occasions: shafts are suitable for mounting into a drill chuck, lathe chuck, drill press or hand drill, and they are helpful to polish the pen, mill the hole and clean the inner tube with the tiny size Suitable size: shafts contain the sizes of 7 mm (0.28 inch), 8 mm (0.32 inch), 9.5 mm (3/8 inch), 10 mm (0.39 inch) in diameter; The cutting 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 center position Easy to clean: the cutting shafts can easily clean and remove the extra glue, bits of wood, impurities, etc. from the tubes and make the tube cut flatter; Please make sure the cutting shafts mount into a drilling or lathe chuck correctly Quality material: the cutter shafts are made of solid carbon steel, which are rust-, sturdy, with nice cutting strength for maximum drilling, and the sleeve adapter is made of brass; The pen barrel trimmer kit provides a practical and convenient tool for your pen blank preparation process Offer convenience: shafts in different sizes fit your needs in your and wood working, which can increase the working efficiency and reduce the energy while doing drilling and milling., Weight: 0.36706966623 Pounds, Manufacturer: Fowecry