KAK INDUSTRY "FLASH CAN"Overall Length- 3.250"Diameter- 1.360"Weight- 4.24ozMilitary style hard anodize for corrosion resistanceMilled 3/4" flats for easy installationFully Precision Machined in House at KAK IndustryBORE CLEARANCE1/2-28 - 9MM or Smaller5/8-24 - 458 or Smaller1/2-36 - 9MM or SmallerM14LH - 30 Cal or Smaller6061 Aluminum device, designed to direct muzzle blast, flash, and gases directly forward, away from the user, enhance firearm appearanceDevice is not designed to reduce muzzle rise or flash signature. Crush washer not included