Product characteristics: Name: Threaded insert. Colour: Gold Material: Brass. Package dimensions: 17.3 x 10 x 2.3 cm. Weight: 158 g Content: 30 pieces M2 x 2.5 mm x 3.2 mm. 30 pieces M2 x 3 x 3.2 mm. 30 pieces M2 x 4 x 3.2 mm. 30 pieces M2.5x4x3.5mm. 30 pieces M2.5x5x3.5mm. 30 pieces M3 x 4 x 5 mm. 30 pieces M3 x 5mm x 5mm. 30 pieces M3 x 6 x 5 mm. 10 pieces M4 x 4 x 6 mm. 10 pieces M4 x 6 mm x 6 mm. 10 pieces M4 x 8 x 6 mm. 10 pieces M5 x 6mm x 7mm. 10 pieces M5 x 10 mm x 7 mm. 5 pieces M6 x 8 mm x 8 mm. 5 pieces 1/4-20 x 12.7mm x 8mm. 1 storage box. Why use brass nuts in injection moulding? Brass has good thermal conductivity, such as the use of integrated heated brass nuts, on the one hand, brass nuts can be heated quickly to speed up work efficiency, on the other hand, the nuts heated. Brass nuts can quickly heat the plastic parts, so that the plastic hole around the hole is smooth for the press. This is the reason why copper nuts are used in injection molding.