Manual on workshop calculations. It contains equivalences of the English metric system to Spanish, trigonometric tables, gears, ordinary and differential division for milling machines, general thread system, cones system, cutting tools, material resistance and thermal treatment, weight lifting, tolerance tables in adjustment, speeds and advances, car repair. This book is written in Spanish by Al Casillas.

Mariano: "As almost everyone in the world of machines, engines, etc. We know that there is a Bible that accompanies us and its name is Casillas. It is a useful book with very important information for anyone who works in these areas. I hope it is useful!"