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Explanation: As far I can see from your excerpt, they mean two shapes of section: square (with side from 60 to 120 mm) and circle with diameter varying from 60 to 150 mm.
Сечение (профиль) продукции - квадрат (со стороной) от 60 до 120 мм и (круг) диаметром 60 до 150 мм.
Note also that billet means брус или (which is better) квадрат, round - кругляк или прокат круглого сечения.
Lingvo 6.5 and some years (in childhood) of practice a plant.
ttagir Local time: 20:46 Native speaker of: Russian, Tatar PRO pts in pair: 1025