Seco Tools India [P] Ltd. Offers Diamond Coated Solid Carbide End Milling Cutters. Seco Tools India [P] Ltd is an ISO 9001 and ISO 14001 accredited company. The Diamond Coated Solid Carbide End Milling Cutters are used by graphite machining companies. The diamond coating protects the edge of the milling cutter to such an extent that the tool life is extended by up to 10 times more than milling cutters with a conventional coating. The Diamond Coated Solid Carbide End Milling Cutters are specially designed for graphite machining and covers diameters between 0.2 to 12.0 mm.