ŞDL & LAS ZIRH was founded in 1978 as a family-owned company Hüseyin Hamdi Şedele. In 1980, ŞDL & LAS ZIRH received patents, a trademark, began serial production of chains from 3.5 to 24 mm and became the third largest producer of chains for tires in the world. In 1997, SDL Chains Ltd., based in Ankara, began producing traction chains with a diverse range of products from the smallest cars to the largest heavy machines and forest machines. In total, the SDL has 13,000 m2 of modern manufacturing plants, with welding, forging, heat treatment, metal laboratory. Today, SDL & LAS ZIRH exports its products to 60 countries on 5 continents.