【COMPATIABLE】This knife-blade battery disconnect switch is suitable for TOP POST TERMINAL, battery POSITIVE post only. Maximum Current: 750A, Rated Current: 250A. 6v 12v 24v car truck, bus, RV, Boat, trailer battery | 【TOP LEVEL & HEAVY DUTY 】This top post battery disconnect switch is made of brass material, corrosion resistance, conductive performance is good, durably made for safety use | 【EASY TO INSTALL】This battery doctor knife switch for top post batteries can be adjusted into a vertical knife switch or a horizontal knife switch through the bottom of the screw, easy to install & simple to use. Switch the knife, then power will cut | 【SAVE ELECTRYCITY】This knife blade master switch is used for the battery to isolate and secure the electrical system, eliminate any power draw from the battery when vehicle or boat is not in use, stop unwanted battery drain and prevent theft or unauthorized use.Widely used for car, truck, boat or RV battery, also other electrical equipment's battery | BUY WITH CONFIDENCE: We are so confident you'll think we have the satisfied battery disconnect switch on the market. If you have any problem about our product, please feel free to give us a message and we will do anything for you to make the thing right. We go out of our way to make sure every customer is happy and satisfied with our product and service.