Angstadt Arms 9mm Flash Hider 1/2-28. Available in 1/2-28 or 1/2-36 thread pitch. Specifications for Angstadt Arms 9mm Flash Hider: Manufacturer: Angstadt Arms Color: Black Finish: Black Nitride Fabric/Material: Hardened Steel Threads per Inch: 1/2x28 Length: 1.75 in Weight: 2.2 oz Included Accessories: Crush Washer Projectile Caliber: .355 Caliber Features of Angstadt Arms 9mm Flash Hider Made from hardened steel with a black nitride finish Includes crush washer 1.75in long Package Contents: Angstadt Arms 9mm Flash Hider Angstadt Arms AAF09HHB28: 9mm Flash Hider 1/2-28