1Function: You can convert side terminal batteries into top posts, each of which has a hexagonal nut ring that can be tightened with a wrench. 2Size: Battery cable terminal thread diameter is 9.2mm / 0.36in; Thread length is 10mm / 0.39in; Please make sure your required size before you purchasing. 3Clear Bottom Remark: We have noted positive (+) or negative (?) at the bottom of each charging post, positive (+) diameter is 17 to 19mm; negative (?) diameter is 15 to 17mm. 4Applicable Batteries: These battery side charging posts are only suitable for threads on automotive batteries. They are not suitable for any type of power sports battery. 5Application Scenario: These terminal charging posts are used to charge the side post battery of the car, and can also convert the side post battery into the top post battery of the car.