Somi Conveyor Beltings, a small-cap industrial company with a 25-year track record, is highlighted as a 'hidden gem' for its transition towards higher-grade products and focus on margins. The company manufactures essential rubber and steel-based conveyor belts crucial for industries like mining, cement, steel, and power generation. Its longevity and customer relationships are noted as key strengths in navigating commodity cycles and demand fluctuations.