Dual (Pos/Neg) Terminal Bus. This systems allow for multiple connections to positive and negative systems on one connection block. Each connection side can maintain multiple connections, of differing size. 3/8" Positive / 5/16" Negative Bus Commonly, positive connections are 3/8", negative connections are 5/16" * Multiple connection points, to accomodate multiple power connections * Secure way to consolidate ground systems * Max voltage: 48vdc * Positive: 3/8" stainless steel connection posts * Negative: 5/16" stainless steel connection posts * Both polarity sides offer 3 smaller 15amp connection points * Base Material: Glass-Filled Nylon (Red & Black) * Mounting screws: #10 (not included) * Mounting centre: 4.9" (124.5mm) Optional cover not included (see IEM-RI738N3P05/1).