Product Description The Rugged Suppressors .338 (6.8mm) Precision Shim Kit helps you properly time and align a muzzle brake or flash hider on compatible barrels. Designed to fit 3/4-24, M18x1, and M18x1.5 thread patterns, this kit includes three shim sizes so you can fine-tune alignment for a secure, square installation. Made in the USA, it&&';;s a simple, effective solution for accurate muzzle device setup. Product Highlights Precision shim kit for aligning/timing muzzle brakes and flash hiders Fits common .338 muzzle device thread patterns: 3/4-24, M18x1, and M18x1.5 Includes three shim sizes for flexible, fine adjustment during installation Shim dimensions: 0.760 in inner diameter / 0.875 in outer diameter Made in the USA Rugged Suppressors accessory for consistent muzzle device alignment Specs Brand: RUGGED SUPPRESSOR Manufacturer Part Number: SA017 UPC: 850044499199 Caliber Compatibility: .338 (6.8mm) Thread Compatibility: 3/4-24, M18x1, M18x1.5 Shim Sizes Included: 3 sizes Shim Dimensions: 0.760 in ID / 0.875 in OD Country of Manufacture: USA Disclaimer: We strive to provide accurate and up-to-date product descriptions, specifications, and images; however, errors or omissions may occasionally occur. We are not responsible for any inaccuracies or discrepancies in the content provided. If you notice anything incorrect or unclear, please contact us so we can correct it. When in doubt, we recommend verifying details directly with the product&&';;s manufacturer.