Description: 1/2x28 Internal Threads - 3/4x16 External Threads Threaded Oil Filter Adapter This adapter is threaded in 1-2x28 inside diameter (female threads) X 3-4x16 outside diameter (male threads) with a 2.5 inch outer diameter 'flange'. Made of T6 6061 Aircraft Grade Aluminum, 2.5 inch outer diameter Increased outer thread length ensures secure attachment to oil filter All threads are CNC cut for smooth easy installation Specification: Material: T6 6061 Aircraft Grade Aluminum Internal Threads： 1/2x28 External Threads： 3/4x16 Diameter: 63.5mm, height: 23mm, Hole external diameter: 18mm Package Includes: 1x Threaded Oil Filter Adapter Note: 1.Please allow 1~3 cm error due to manual measurement, thanks. 2.Due to the difference between different monitors, the picture may not reflect the actual color of the item. Please understand, thank you