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 (+) or negative (-) at the bottom; (+) dia.:17-19mm; negative (-) dia.:15-17mm. These terminal charging posts are used for charging side post batteries on automobile as 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 (+) or negative (-) battery cable terminals. Constructed of Alloy for ,intended use for: top post, side post, , and battery terminals. The battery terminals fit for and negative standard battery posts of , boats, van batteries and others. Specification: Thread dia:8mm/0.31Inch Thread length:10mm/0.39Inch Colour:Silver Material: alloy Size:3.8 x 2.4cm Contents: 1 * Battery terminal connectors 1 * Negative Battery terminal connectors Only the above content, other are not included. Note: Light and different displays may the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.