Features 1,Application: The heavy duty M9x0.75 to 1 or 2‑28 adapter is designed replacement for Sig Sauer 1911 22, GSG 1911 22, 5PK 22 and some others that have M9x0.75 threads. 2,Flat Ridges Design: M9x0.75 to 1 or 2‑28 thread adapter comes with flat ridges for easy installation removal with a wrench (not included), improving the operating efficiency. 3,With Thread Protector: The M9x0.75 to 1 or 2‑28 adapter is equipped with a 1 or 2‑28 thread protector to protect the 1 or 2‑28 thread for use without an accessory or for storage. 4,Knurl Design: The 1 or 2‑28 thread protector is professionally designed with fine diamond knurl, looks attractive and great, and features greater friction to prevent slip. 5,Durable Construction: The M9x0.75 to 1 or 2‑28 converter with thread protector is constructed from premium high carbon steel with black oxide finish, not easy to rust, highly durable in use. Specification Item Type: M9x0.75 to 1 or 2‑28 Adapter Material: High Carbon Steel Pipe End Thread: M9 (9mm) x 0.75mm Adapter Outer Diameter Thread: 1 or 2-28 Cover Fully Screwed in Length: Approx. 1.25in or 3.2cm Maximum Diameter (with Protective Cap Installed): Approx. 5 or 8in or 1.59cm Fitment: For Sig Sauer 1911 22, GSG 1911 22, 5PK 22 and some others that have M9x0.75 threads. Package List 1 x M9x0.75 to 1 or 2‑28 Adapter Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement.