All in 1 Helicoil Thread Repair Kit. Load and insert the helicoil. Remove the tang form the helicoil with the break-off tool. 304 Stainless Steel Helicoil Kit. Thread Inserts Heli Coil Size: M5x 0.8x 6.7mm(25PCS ), M6x 1.0x 8.0mm(25PCS ), M8x 1.25x 10.8mm(25PCS ), M10x 1.5x 13.5mm(25PCS ), M12x 1.75x 16.3mm(10PCS ).