【Good Conductivity】: This 333 type M6 battery binding post is made of copper with red and black mark, with good electrical conductivity of brass, not easy to heat Safer Bakelite Material: This electrical junction connector kit uses insulating and flame-retardant materials, safer to resist high temperature and corrosion Widely Used: These battery connectors are widely used for the separation and distribution of welding machines, boats, RVs, charging generators, trucks, automobiles, solar cells Detachable Design: This nut system makes it easy to install and simple and flexible to extend, tighten and assemble the connector 【Main Parameters】: Total length: 45mm. 8.5mm threaded hole. Installation hole spacing: 9mm. Stud: 6.35mm, M6. See image for details.