Single Circuit ON-OFF with Locking Key Black. 300 Amps continuous rating for outboards and small gasoline or diesel engines. Tin-plated copper studs for maximum conductivity and corrosion resistance. Studs accept 3/8 M10 ring terminals. 7/8 22 mm stud length accepts multiple cable terminals. Blue Sea Systems one-piece terminal stud design never loosens over time. One-piece stainless flange nuts ensure safe and secure connections. Isolating cover protects rear contacts. Breakout tabs allow wire access in any direction. Specifications . Switch Type Single Circuit ON-OFF. Color Black. Maximum Voltage 48V DC. Continuous Rating 300A. Intermittent Rating 500A. Cranking Rating 30 sec 900A Single Circuit ON-OFF with Locking Key Black. 300 Amps continuous rating for outboards a Manufactured by Blue Sea Systems. Part Number 6004200