Berea Hardwoods Bushings 11A are precision-engineered round steel pieces designed to slide smoothly on the mandrel between mounted pen blanks. They allow you to turn the wood down precisely to the top of the bushings, ensuring the correct wood size for your project. Each kit includes specific bushings tailored for particular pen models, with the letter after the bushing number indicating the compatible mandrel, such as A or B. These bushings are i for use with the Carbine Ballpoint Pen, helping you achieve professional results with ease. Model Number: 11A