Used Shrewd Muzzle Brake 7mm Magnum, 5/8-24 Thread, Magpul Flat Dark Earth Cerakote Finish.  Brake outside diameter is approximately .836 inches.  Brake overall length is approximately 2.634 inches.  Muzzle opening is approximately .309 inches.  Depth of threaded hole, including thread relief, is approximately .600 inches.  See pictures for condition and ask any questions before bidding.  Threads have dried Loctite 222 on them which helps provide resistance to loosening.  Out surface has some minor scratches as shown in picture, but these do not affect performance.  Brake exhaust holes are located all around the 360 degree outer wall of brake and face forward 7 degrees to reduce noise and blast to shooter's position.  Brake was originally purchased from Brownells and has had the muzzle reamed out concentric with the 5/8-24 thread for 7mm magnum, and cerakote finished in Magpul flat dark earth coating.  This brake was shot without issue on a Remington Sendero 7mm Magnum using Gerber VLD Hunting bullets, 168 grain.  Brake has about 50 rounds through it.  Buyer assumes all risk associated with the installation, cleaning, and use of this brake on any firearm or for any other purpose and releases seller of all liability for any reason whatsoever.  Buyer also waives the right of any relative or other acquaintance to hold seller liable for any reason associated with the purchase or use of this brake.  Auction includes shipping charges to lower 48 USA states.  Item can not be returned, sold as-is.  If you live outside the lower 48 states, USA, then please contact me in advance prior to bidding in order to ensure item can be sent to you and that you accept associated costs for shipping.  Seller reserves right to refuse shipment to any country or region where device is prohibited.  Buyer is responsible for knowing in advance and before bidding whether they are permitted to receive this item.  Any questions please send me a message and thanks for your interest.