Package Include-- You will receive 4 pcs pilot cutter shafts, 1 pc adaptor sleeve, 1pc cutting head, 1pc hex key wrench and 1pc silicone box. Suitable for any solid wood and synthetic wood.Premium Material-- These pen mill set is made of high quality carbon steel, the sharpness and hardness are trustworthy, not suitable for fracture and rust. Suitable for long time use.Convenient To Use-- The copper tube can prevent chattering when milling the hole, the cutting head is durable, and the sharpness can be restored after a little grinding on the grinder.Really Helpful-- Even a skilled carpenter cannot completely ensure that the hole is perpendicular to the cross section when dealing with small drill diameters. This set of tools can solve this problem.Tips For Use-- Flatten the two ends, scrape out the dry glue of the nozzle with the front end, then insert it into the tube and rotate it slightly, and then start milling.