Sterling Tools has expanded its operating margin to 20.9% while its peers in the auto ancillary sector saw margins drop. This is due to Sterling diversifying its client base and obtaining better prices. Sterling focuses on high priced fasteners and has increased its market share with key customers like Maruti Suzuki. Sterling's varied portfolio and growth in customer segments like commercial vehicles has helped drive revenue growth of 10-12% despite demand fluctuations in any one segment.