The term “シリンダー” means “cylinder,” and in the manufacturing industry, the cylinder is the most important part of an engine. Cylinder basically involves piston movement, and reducing the friction of piston movement is of utmost importance.For this reason, honing is the mainstream method of precisely polishing the inner diameter of the cylinder. Engines have different names depending on the number of cylinders and the arrangement of cylinders, such as “single cylinder”, “in-line engine”, and “V-type engine”, which are used in cars, light cars, racing cars, large cars, motor bikes,… The selection method also differs depending on the situation.