Parveen Industries Pvt. Ltd. Manufactures High Strength Conventional Mandrels. The High Strength Conventional Mandrels falls in the category of Gaslift Equipments. Parveen Industries Pvt. Ltd. Is an ISO 9001:2000 certified company. The High Strength Conventional Mandrels are of round exterior design that makes them easy to rotate in difficult situations and perform easier wash over operations. These mandrels exceed N-80 tubing strength.