ITEM NAME:1/2-28 To 3/4-16 Threaded Adapter Automotive Oil Filter Steel Black Knurled C3c Features: These universal spacers are useful when upgrading your system. Black Oxide Steel Knurled Threaded Oil Filter Adapter . Aggressive knurling for a secured grip. Made of Steel,anti-corrosion,long-term service life. Straight Bolt-on, NO modification needed. Specifications: Thread Type: Straight Material:Steel External Threads:3/4-16 Internal Threads:1/2-28 Color:Black Package Included:1pc 1/2-28 to 3/4-16 Threaded Adapter.Black Oxide Steel Knurled Threaded Oil Filter Adapter. External Threads:3/4-16. Internal Threads:1/2-28. Straight Bolt-on, NO modification needed. Thread Type: Straight.