If you want to learn how to grind your own materials faster and efficiently, or to simply make better black powder, this book's for you. This 66 page manual contains plans, bills of materials, tool lists, and clear, step-by-step instructions for building a homemade, yet durable and high quality ball mill. Also included are sections on grinding media and casting your own lead media. 7 illustrations, 6 photographs. Shipping weight 2 lbs.