YHM's new line of sRx products were designed with aesthetics and ease-of-use as the top priorities, and that is no different for the YHM sRx Short Flash Hider (YHM-4445's). This Q.D Flash Hider comes in three variations (5/8" x 24, 5/8" x 32 & 11/16" x 24") and it's compatible Q.D. Adapter/Mounting Interface attaches to the industry standard (HUB) 1-3/8" x 24 threads. It features an internal taper seal-in front of the threads-that locks your suppressor on and forms a tight seal to contain gasses while in-use. This means no gasses or debris can build up on the threads. The sRx Short Flash Hider must be paired with The YHM sRx Adapter (YHM-4400) . The sRx Short Flash Hider adds minimal length and weight to the suppressor set up, while also allowing you to reap all the benefits of the new YHM sRx System-when used in conjunction with The sRx Adapter. The full YHM sRx (Suppressor Rx) System will be the obvious choice for someone looking for a sleek, low-profile, suppressor set up-that's also built to withstand rigorous use. This is our prescription for the shooter who cares about the aesthetics of their build as well as its ease-of-use. Muzzle device length is 1.8". Length added to barrel is 1.175" (on barrels with 0.6" threads). Some of the exciting new benefits of the YHM sRx System are as follows: a TIMELESS. (No need to shim/time to barrel) a Small/low profile a No moving parts a Large taper in front of the threads allows for consistent mounting. a Lighter than many Q.D. mounting offerings on the market a Can be permanently attached to firearm barrel needed Length: 1.8125" Diameter: .75" Material: 4140 Steel Finish: Black Phosphate Thread Size: sRx Caliber: .45 Caliber The YHM sRx System-just what the doctor ordered!