JARD Hex Brake 9mm Luger 1/2x28 4140 Steel Alloy Black. The JARD Hex Brake Compensator features 3 pluggable topside portholes and 2 large side portholes for exceptional recoil mitigation. This muzzle device is designed to reduce sight picture movement caused by recoil and as a result reduce follow-up shot time. The angular design isn't just bark this brake has bite: Exiting gas first encounters the central topside porthole for downward muzzle push then encounters the left and right angled topside portholes. These portholes can be plugged to better accommodate left or right handed shooters respectively. Alternatively all three topside portholes can be left unplugged to maximize upward gas ventilation for downward muzzle push. Finally the majority of gas exits the bake by venting outward through the 2 large side portholes mitigating gas blowback and felt recoil. Get the most out each shot - Get a muzzle device designed to perform. 3 set screws for portholes and thread locker included with purchase. Part Specifications: Overall Length: 2 1/8" Outside Diameter: 3/4" Thread Pitch: 1/2-28 Material: 4140 Alloy Finish: Matte / Blued Specifications for JARD Hex Brake: Manufacturer: JARD Color: Black Fabric/Material: 4140 Alloy Steel Threads per Inch: 1/2x28 Outer Diameter: 0.75 in Length: 2.125 in Package Contents: JARD Hex Brake JARD 4612: Hex Brake 9mm Luger 1/2x28 4140 Steel Alloy Black