As a manufacturer of mechanical springs, Royal Coil can punch press, die tool & four-slide to produce an array of springs such as compression springs with diameters from .008 - .250, extension springs from .008 - .209 diameters, & torsion and double torsion springs ranging from .008 - .209 diameters. ISO 9001: 2000 certified, we manufacture quality custom industrial springs that are right for you.