Specification: 100% Material: Lead Color: As shown in the picture Post length: 18mm Negative internal diameter: 11mm (Top) / 13mm (Base) Positive internal diameter: 13mm (Top) / 15mm (Base) Outer diameter: As shown Conversion: 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 install, simply place over the battery post and connect terminal Includes a pair of negative and positive adapters Package included: 2 x Battery Post Adaptor Sleeves Notice: 1. Please allow 1-3mm error due to manual measurement. Please ensure you are comfortable with this before purchasing. 2. Colors may vary slightly due to differences in monitor displays. Thank you for your understanding.