Medium Duty Battery Selector Switches Diameter: 5-1/4" Depth: 2-5/8" Polycarbonate Body with Brass Terminals Ignition Protected For use with 6 to 32 Volt Marine Electrical Systems Capacity - 250 AMPS Continuous, 360 AMPS 5 Mins. Intermittent Terminal Stud Size: 5/16" When used with Non-Unitized Alternators, these models will interrupt the field current (reducing the possibility of damage) if turned "OFF" with the engine running. Specifications: AFD: Yes Lockable: Yes Positions: 2 Continuous Amperage: 250a Box Dimensions: 3"H x 6"W x 8"L WT: 0.95 lbs UPC: 085226560026 Quick Guide (pdf)