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). Custom thread options available upon request. Material: 304 stainless steel Precision CNC manufacturing ensures a precise fit and easy installation Manufactured from high-grade stainless steel Increased outer thread length ensures secure attachment to accessory All threads are CNC cut for smooth, easy installation All adapters are checked with go/no-go thread gauges to confirm threads are properly cut and sized Scope of supply: 1 x Stainless Steel Adapter Thread: 1/2x28 Material: Aluminum Color: black, silver, red, blue, purple Note: Light shooting and different displays may cause the color of the item in the picture to be slightly different from the real thing Package Included: 1x Thread Protector Knurled for quick, tight, and tool-free use Small and compact, highly effective Fits all 1/2x28 threaded barrels