Features Package Includes: Package includes 4 different sized guide shafts, 6 pen bushings, 1 cutting head, 1 socket adapter and 1 hex key to meet most pen polishing requirements. Carbon Steel Shaft: The pen barrel trimmer kit is made of solid carbon steel, which is rust proof, strong and possesses strong cutting strength for maximum drilling. HDPE Pen Bushing: Made of HDPE, the pen bushing has good heat and cold resistance, good chemical stability, high rigidity and toughness, it will not stick to your pen, which is very convenient! Sleeve Adapter: This O style sleeve adapter fits pilot shaft over 7 mm to keep it in the center position, check the size! Scope of Application: Our cutter 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. Feature: 1. Energy Saving: The synthetic bushings allow you to access and finish the ends of your pieces easily unlike the flush steel bushings, which is time and energy saving. Specification: Item Type: Pen Barrel Trimming System Material: Carbon Steel, HDPE Trimmer: Approx. 7 mm/0.28in, 8 mm/0.32in, 9.5 mm/0.37in, 10 mm/0.39in Cutting Head: Outer Diameter: Approx. 19mm/0.75in Inner Diameter: Approx. 6mm/0.24in Pen Bushing: Width: Approx. 0.55in/1.4cm Height: Approx. 0.43in/1.09cm Package List: 4 x Pilot Cutter Shaft 1 x Sleeve Adapter 1 x Hex Wrench 1 x Cutting Head 6 x Pen Bushing 1 x Storage Box Package List 4 x Pilot Cutter Shaft 1 x Sleeve Adapter 1 x Hex Wrench 1 x Cutting Head 6 x Pen Bushing 1 x Storage Box