Very good machine work.

Quality adaptors. Threads are around 2A and 2B fit.

These are a nice pair of objects, machined from some stainless alloy (non-magnetic, at least my magnets showed no reaction) and true to advertising pitch and TPI per my tap and die set.Coming in a small sealed bag along with 4 o-rings, this is a handy set of objects for their intended purpose - whatever that may happen to be. I think they might have something to do with fuel injection, but I cannot be sure.While I have no immediate use for such objects, they are well made and will certainly store well in case there is ever a use for them that I need to investigate.

If you want to quiet a smaller diameter with a larger can, it much cheaper that the adapters sold from the manufacturers and works well.

The Wulankd 2 Pack Thread Protector, 1/2 x 28 ID to 5/8 x 24 OD, is a set of high-quality stainless steel thread adapters designed to protect and adapt firearm threads for a secure fit. Here's a review based on key features:1. Build Quality and DurabilityStainless Steel Construction: These thread protectors are made from high-grade stainless steel, ensuring long-lasting durability and resistance to corrosion. This makes them well-suited for use in harsh environments or around moisture, such as outdoor shooting ranges.Robust and Reliable: The stainless steel material adds strength and resilience, ensuring that the protectors hold up well under frequent use and maintain their integrity over time.2. Compatibility and FunctionalityThread Adaptability: The thread protectors feature an inner diameter (ID) of 1/2 x 28 and an outer diameter (OD) of 5/8 x 24, allowing for easy adaptation between different thread sizes. This ensures that the adapters fit various barrels or muzzle devices with different threading specifications.1/2 x 28 C to 5/8 x 24 Adaptation: They are specifically designed to convert 1/2 x 28 threaded barrels to 5/8 x 24 threaded devices or vice versa, providing flexibility in matching different muzzle devices or suppressors with your firearm.3. Ease of UseEasy Installation: The thread protectors are straightforward to install and remove. Users report that the adapters screw on securely without the need for special tools, making them quick and easy to use in different setups.Snug Fit: Once in place, the thread protectors fit securely without any wobbling, preventing damage to threads and ensuring that the muzzle devices or suppressors can be safely attached and detached.4. Protection and Thread SafetyProtects Threads: The primary function of these adapters is to protect the firearm’s threaded muzzle from damage, dirt, and debris when a suppressor or other muzzle device is not in use. By covering the threads, they help prevent corrosion or accidental damage to the threads, ensuring longevity.Preventing Cross-Threading: With these protectors in place, users reduce the risk of cross-threading or other thread damage during installation or storage.5. Value for MoneyTwo-Pack: The 2-pack provides great value, as users receive two adapters for the price of one. This allows you to keep a spare or use them across multiple firearms with different thread sizes.Affordable: Given the durability and functionality, these thread protectors offer a cost-effective solution to keeping your firearm's threaded barrel in top condition while offering compatibility across various devices.6. Customer FeedbackMost users report positive experiences with the Wulankd Thread Protectors. They appreciate the robust construction, ease of installation, and secure fit. Many also note how well the adapters protect threads during storage or transport, keeping their firearms in good condition.Some users have mentioned that the protectors are especially useful when switching between different muzzle devices or suppressors with different threading requirements.ConclusionThe Wulankd 2 Pack Thread Protector is a reliable, durable, and cost-effective solution for protecting firearm threads. Made from high-quality stainless steel, these adapters offer excellent protection against dirt, debris, and thread damage. The easy installation, snug fit, and compatibility with multiple thread sizes make them an excellent choice for firearm owners who frequently switch between different accessories. If you're looking for an efficient and affordable way to safeguard your firearm’s threaded muzzle, these thread protectors are a solid choice.