Specification:100% Brand new and high qualityMaterial: PlumbumColor: As the picture showsPost length: 18mmNegative internal diameter Size: 11mm(Top)/13mm(Base)Positive internal diameter Size: 13mm(Top)/15mm(Base)OD Size:AS showConversion: 1mm=0.039 inch, 1 inch=25.4mm Features:Designed for positive and negative side post battery connections.Made from high quality materials and metal for optimal power transfer.To fit simply place over the battery post and connect terminal.Pair Of Negative & Positive Adapters Supplied.Package included2 x Battery Post Adaptors Sleeves Notice:1.Please allow 1-3mm error due to manual measurement,Please make sure you do not mind before you bid.2.The colors may be a little difference for the different monitors displays, please understand.