Heli-Coil Insertion Tools - Prewinter Type are available as both plain slotted and threaded mandrel captive and non-capitive tools ranging from size M1.6, M2 – M39 and in UNC/UNF category from 1-64 to 1-1/2 inch. Heli-Coil insertion tools comes in variety of configurations such as Threaded Mandrel Type Insertion Tool Threaded Mandrel Prewinter tools having threaded nozzle: Tool is available as both Capitive and Non-Capitive type depending on size and pitch. Plain Mandrel Prewinter tools having threaded nozzle Tool is available as both Capitive and Non-Capitive type depending on size and pitch. Larger insertion tool sizes are also available and made on request. Heli-Coil Prewinter tools are best suited for easy and fatigue free installation of inserts in production line to achieve a high quality of Heli-Coil insert installation and prevent jumping of coil threads. Threaded mandrel prewinders are also best recommended for successful installation of screw locking inserts and free running inserts having a fine thread pitch.