Blackout Defense 5/8-24 Keymo Flash Hider Black. The KeyMo Flash Hider is compatible with Dead Airs KeyMo-equipped silencers. Specifications for Blackout Defense Keymo Flash Hider: Manufacturer: Blackout Defense Finish: Nitride Fabric/Material: 17-4 Stainless Steel Features of Blackout Defense Keymo Flash Hider In-house heat treated to condition H900 for a through-hardness of 45-47 HRC 17-4 stainless steel that is heat treated to condition H900 exhibits 14percent higher ultimate tensile strength over hardened 4140 steel Every 90 degree corner is machined with undercut profiles to improve seal and engagement with the suppressor Closed-prong design reduces flash and eliminates tuning-fork ping Package Contents: Blackout Defense Keymo Flash Hider Shim kit Blackout Defense MUZZLE-5/8-KEYMO-FH-BLK: 5/8-24 Keymo Flash Hider Black