Auto-Darkening Welding Helmet ideal for electric welding, argon arc welding, gas shielded welding and tinsoldering, etc Auto-Darkening Welding HelmetVRKM8000-1Technical parameters:Light ... (Min. Lifetime: 5, 000 Welding Hours)Viewing area (mm): 100 x 49Weight: 450GMaterial of helmet: NYLONAvailable color: Blue/ black/ ... knob19. locknut20. regulating nut21. regulating knob Auto-Darkening Welding Helmet