If you're building custom fuel systems, oil lines, or any high-performance plumbing, these SYKRSS 6AN 90 degree fittings are seriously quality components! Machined from 6061-T6 aluminum, they're lightweight yet incredibly strong, with a black anodized finish that looks professional and resists corrosion. The 6AN size with 7/8-14 UNF threads is standard for AN fittings, and the 90 degree angle is perfect for those tight spaces where straight fittings won't work. What's really nice is they're designed specifically for PTFE-lined stainless steel braided hose with brass compression sleeves that create secure, leak-proof connections. These aren't just for fuel either - they work great for breather lines, vacuum systems, hydraulic return lines, gauge connections, and various oil/water/air applications. The 37-degree JIC flared sealing surface ensures proper sealing without over-tightening. The machining quality is precise with clean threads and smooth surfaces that won't damage your hose. SYKRSS stands behind these with a 30-day money-back guarantee and 6-month replacement warranty, which is nice peace of mind. Whether you're building a custom fuel system for a performance vehicle, plumbing an air system, or any project requiring reliable AN fittings, these deliver professional quality at a reasonable price. Definitely a step up from cheap imported fittings that might leak or fail under pressure.