Salmon River Solutions Dead Air/Diligent Defense Muzzle Brake 1.125x28 Anodized Black. Because it is a directional brake it will need to be timed. A shim kit is included with this product. THIS BRAKE ONLY WORKS WITH DEAD AIR AND DILIGENT DEFENSE CANS WITH 1.125-28 THREADS. DEAD AIR: SANDMAN NOMAD WOLVERINE. DILIGENT DEFENSE: ENTICER SERIES. Specifications for Salmon River Solutions Dead Air/Diligent Defense Muzzle Brake: Manufacturer: Salmon River Solutions Color: Black Finish: Anodized Fabric/Material: 7075 Aluminum Threads per Inch: 1.125x28 Length: 1.5 in Weight: 1.3 oz Height: 1.5 in Width: 1.5 in Package Contents: Salmon River Solutions Dead Air/Diligent Defense Muzzle Brake Spanner Wrench Shim Kit Salmon River Solutions 1149: Dead Air/Diligent Defense Muzzle Brake 1.125x28 Anodized Black