1. Multi-layer electroplating process on the surface, not easy to fall off, bright and clean, and smooth to the touch 2. Refined copper raw material + corrosion-resistant nickel-plated layer + high-brightness chrome-plated layer, thickened to prevent cracking, compression and explosion-proof 3. 3/4 points interface, deep thread, tight installation without leakage, pressure resistance and explosion-proof damage 4. Size: the short version of the rotary switch is about 10x10 cm, the long version of the rotary switch is about 13.3x10 cm, the press switch is about 12x11.5 cm, the fast open handle is about 10x6.5 cm, and the fast open flat mouth is about 10.6x8.9 cm
