1.voltage test proof 2.aluminum or brass ... sale letter of quality commitm 2 electrical wire cable connector 1)Simple installation, small contact resistance and low temperature rise ... 10KV, 1KV or less than 1KV.3)Piercing connector,simple installation,need not strip the cable coat.4 ... anti-corrosion,extend the using life ofInsulated lead and connector.6)Adopted special connecting tablet, apply to joint ...