Volkel made in Germany V-Coil Thread repair kit No. 04111 UNC 1/2. - 10x Wire thread inserts - type S - free running UNC 1/2 x 13 – 1.5 D. Thread Armour Plating for material with low shear strength. Wire Thread Inserts DIN 8140, tolerance ISO 2 (6H), Type S - free running, from stainless steel.