Features and Application: For Plastic vary from communication equipment, the automotive industry, computer industry, and anywhere where strong durable threads are required in plastics. Brass Helical Knurled Inserts are compact inserts suitable for insertion in all types of plastics and can be used with hot plastic Moulding and cold plastic molding. It can be molded / plotted-in. Brass Helical Inserts are best suitable for electrical moulded box application. Available unheaded, headed and reverse headed. Imperial thread sizes and studded versions also available.