Seco Tools India [P] Ltd. Offers Rough Boring Heads with Diameter Capacity of 18 to 205 mm. Seco Tools India [P] Ltd is an ISO 9001 and ISO 14001 certified company. The Rough Boring Heads with Diameter Capacity of 18 to 205 mm is designed with only eight boring heads. This boaring head of model number A750 are developed for highest possible boring performance.