Genuine Contact Tip Bernard Centerfire series T-062 for (1/16") (1.6 mm) Wire. Size: 1.50 (38.1 mm) Installation Instructions Install insulator cap over neck. Trim liner to 5/8" beyond neck thread. Torque diffuser onto neck to 12 ft-lbs. Insert tip into diffuser. Thread nozzle onto diffuser/tip, and tighten firmly by hand.