Converts side terminal battery to top post,each Charging Posts features a hex nut ring for tightening with a wrench. Thread dia:8mm; Thread length:10mm; remark positive (+) or negative (-) at the bottom;positive (+) dia.:17-19mm; negative (-) dia.:15-17mm. These terminal charging posts are used for charging side post batteries on automobile as well as converting side batteries to top post batteries on automobiles. These battery side charging posts are made to fit the threads on automobile batteries only. They do not fit any type of batteries. Fit positive (+) or negative (-) battery cable terminals. Constructed of Zinc Alloy for ,intended use for: top post, side post, truck, and marine battery terminals. The battery terminals fit for positive and negative standard battery posts of cars, boats, van batteries and others. Specification: Thread dia:8mm/0.31Inch Thread length:10mm/0.39Inch Colour:Silver Material:Zinc alloy Size:3.8 x 2.4cm Package Contents: 1 * Positive Battery terminal connectors 1 * Negative Battery terminal connectors Only the above package content, other products are not included. Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.