L. V. Engineering Co. Manufactures Rings for Shafts. L. V. Engineering Co. Also manufactures various types of locking devices. The Rings for Shafts are made of high carbon spring steel. The Rings for Shafts have consistency of dimensions. These Rings are made in factory fully equipped with modern machinery and heat-treatment plant plus testing equipment. These Rings undergoes a thorough check-up, chain-wise, right from the selection of materials to the final finishing stage.