Duroshox, a part of duro group of companies, offers various products for engineering and automobile industry. As part of these products, the company offers coil springs ranging. These are available from 0.3mm to 12mm wire diameters. These are available in various types including extension, compression, torsion, spiral springs. These are coiled on high precision machines, ground, heat treated and shot blasted. These coil springs can be powder coated or chrome plated.