Check the listing for details. .45 cal Muzzle Brake 37/64"-28 TPI, Black anodize, Thread on, Micro. Color: Black, Condition: New. Listed at 32.00 USD. YOU NEED A 37/64-28 THREADED BARREL TO USE THIS ITEM. DO NOT BUY THIS IF YOU DO NOT HAVE ONE. This is a high quality, aluminum muzzle brake compensator. It is made in the USA (Minnesota actually). Features include: .45cal .45 ACPthreaded for 37/64"-28 tpi (0.578-28) right handed threadsCOUNTERBORED: this feature on the slide facing side lets the brake get closer to the slide to make the gap smaller!width is more narrow that most Glock slides, only 0.92" wideflush with the top of the glock slidedistance (or gap) from the front of the slide depends on your particular barrel but is reduced by up to 1/16" because of the Counterbore.add just 0.400" to the length of the threaded barrelMade of 6061 AluminumAnodized black hard coat type IIIheld on with #10-32 x 3/16" nylon tipped set screws (so it will not scratch barrel threads) (included) tighten set screws to 10-12 inch pounds This reduces felt recoil for competition, or duty. Works better with higher grain/higher power loads (they have more gas to push back against the brake with). In some cases, very light gamer loads will not cycle the action unless springs are changed out. Set screws are tightened with a 3/32" allen wrench (included). When tightened down the tops of the allen screws are below flush with the side of the compensator. On screws this small about 10 inch pounds is all the tighter you want to get them. You can loctite the set screws and the comp on if you want with temporary loctite (not included). See my store for individual tubes if you need it! Please read the following notes before completing your order: 1. Please check your shipping address carefully before checkout, if it is wrong contact me, I'll fix it. 2. If I receive a package for RETURN TO SENDER or because of incorrect address, the refund will be processed excluding our shipping cost. Shipping 1. Warehouse Location: Minneapolis, MN 2. Free shipping by USPS Ground service 3. Estimated delivery: 3-5 business days after shipping. Feedback 1. I leave POSITIVE FEEDBACK after receiving the payment. Please contact me if you are not satisfied with the item after receiving it. 2. If you are dissatisfied for any reason, please do not be quick to leave negative/neutral feedback. Please contact me and I will work hard to fix the issue for you. 3. We work hard to make sure EVERY CUSTOMER is 100% SATISFIED and resolve any problem for you have and always leave positive feedback to all our customers. I am not satisfied until you are.