HeliCoil Tangless Insertion Tools – Guage Type are available from size M2 – M12 and in UNC / UNF category from 1-64 to 1/2”. HeliCoil Tangless insertion tools Gauge type are quick and easy to us. They are best suited for easy & fatigue free installation of inserts in production line to achieve a high quality of HeliCoil insert installation & prevent jumping of coil threads.