Check the listing for details. DELTAC® "Slingshot" muzzle brake for 1/2-28RH - Complete threading kit. Condition: New. Listed at 79.99 USD. We believe that threading the barrel of your rifle is the most effective method to install a muzzle break. Threading your barrel with the use of the enclosed threading tool insure your thread are true and are permanent but ensure reliability and accuracy. We also suggest this to be done by a gunsmith. Muzzle Brake Length: 2.520 inchesCALIBER: Chose your caliberExit hole .340 inchesThread: 1/2-28RHMachined from top quality steel and finished in black oxide. Counts as 1 US922r compliant part.Die HSS Round die adjustable 1/2-28RH Recommended barrel OD sizes for threading is 0.4924 min and 0.4989 maxThread alignment tool: CALIBER: 9mm, 270, 5.45, 7.62 or .223 (CHOOSE YOUR CALIBER) It helps you get the die started level and on-center to prevent costly mistakes. Material: 303 Stainless Steel#5 Die HandleThis is a heavy-duty #5 die handle is approx. 10.75in long and accepts 1.5in dia (38mm) dies. The handle ends are removable. These are high quality handles made of high tensile steel. PKG Content: 1 Threaded Slingshot muzzle break 1 HSS 1/2-28RH round Die 1 Stainless Steel Thread alignment tool #5 die handle Muzzle Threading InstructionsSkill Level: Advanced Please consider your skills before attempting to modify a firearm. Although this is a DIY kit advanced skills are required beyond the written instructions. Modifying a firearm without the proper skills are dangerous to both you and others.