X-Haibei Battery Terminal Connectors Pair of Wing Nut Marine Brass Battery Terminal Clamps Pos/Neg Stud Size M8 Black Red Ends for Boat RV Car Quantity:2 pcs( 1 Positive+1 Negative) Made of high quality brass ,the conductivity is good . Color:Red and Black Voltage: 12 and 24 V,Screw Thread:M8 Inner Dia. Red wing nut:0.7inch, Black wing nut 0.65 inch