Thread size:female 1/2-20 RH to 1/2-28 RH male(FT03K)female M13.5x1 LH to 1/2-28 RH male(FT03EL)female M14x1 LH to 1/2-28 RH male(FT03FL)female M14x1 RH to 1/2-28 RH male(FT03F)female M15x1 RH to 1/2-28 RH male(FT03G)female M15x1 LH to 1/2-28 RH male (FT03GL)If you have other thread requirements, please contact us, we provide custom serviceMaterial: 304 stainle steelPrecision CNC manufacturing ensures a precise fit and easy installationManufactured from high grade stainle steelIncreased outer thread length ensures secure attachment to acceoryAll threads are CNC cut for smooth easy installationAll adapters are checked with go/no go thread gauges to confirm the threads are cut and sized correctlyScope of supply:1 x Stainle Steel Adapter===================================================================: 1/2x28 threads.Material: AluminumColor:black silver red blue purpleNote: Light shooting and different displays may cause the color of the item in the picture a little different from the real thing.Package Included:1x Thread ProtectorKnurled for quick, tight and toole use.Small & Compact highly effective.Thread: 1/2x28 threads.Material: AluminumColor:black silver red blue purpleNote: Light shooting and different displays may cause the color of the item in the picture a little different from the real thing.Package Included:1x Thread Protector100Fits all 1/2x28 threaded barrels.Knurled for quick, tight and toole use.Small & Compact highly effective.Thread: 1/2x28 threads.Material: AluminumColor:black silver red blue purpleNote: Light shooting and different displays may cause the color of the item in the picture a little different from the real thing.Package Included:1x Thread