SeaChoice 4-Position Battery Selector Switch witho Lock - The Seachoice 4-Position Battery Selector Switch Without Lock allows selection betrween batteries for starting and charging or operation of both batteries in parallel.You can use the Seachoice 4-Position Battery Selector Switch Without Lock with two or more batteries for systems under 50V. These switches can be mounted in numerous locations, and as ignition protected switches, they can be installed in the engine rooms of gasoline powered boats. These battery switches are designed for surface mounting. Standard duty switches have a bright red polycarbonate housing for safety with a large easy-to-turn black knob. The housing of the heavy duty switches are red fiber-reinforced polycarbonate. Selector switches are designed with a "make before break" feature. This allows switching between the "1", the "ALL" and the "2" positions while the engine is running. Made in the USA. Features: Diameter: 5-1/4in Depth: 2-5/8in Polycarbonate Body with Brass Terminals Ignition Protected For use with 6 to 50 Volt Marine Electrical Systems Capacity - 250 AMPS Continuous, 360 AMPS 5 Mins. Intermittent Terminal Stud Size: 5/16in