Usage Tips:Suitable size: the pilot 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 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 center position Quality material: the cutter shafts are made of High-quality materials, which are rust-resistant, sturdy, durable with nice cutting strength for maximum drilling, and the sleeve adapter is made of High-quality materials; The pen barrel trimmer kit provides a practical and convenient tool for your pen blank preparation process 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 Various occasions: the pilot 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 Offer convenience: The pilot shafts in different sizes fit your needs in your daily life and wood working, which can increase the working efficiency and reduce the energy while doing drilling and milling.Durable cutting head: The cutting head of the pen barrel trimming set is solid and durable with pointed cutting, which is practical and can be applied multiple times without getting blunt. It is easy to polish the cutting edge for flatness. Notes: Small parts are included, please keep away from children. Material: steel colour: silver Package Contents: 4 x guide shafts in different sizes(7mm, 8mm, 9.5mm, 10mm) 1 x cutting head 1 x socket adapter 1 x hex wrench 1 x drill bit Only the above package content, other products are not included. Note: Light reflection and d