Features: Upgrade your exhaust systems with 25 premium 8mm brass nut featuring auto locking design and erosion resistant properties for shaking proof fastening in high temperature environments. These 12mm wrench size hexagonal nut combine accuracy 1.25mm threading with copper enhanced brass construction, ensuring optimal heat dissipation and secure installation using standard automotive tools. Ideal for automotive technicians, motorcycle enthusiasts, and industrial maintenance crews requiring stable fasteners for engine components and mechanical assemblies. Perfect for securing exhaust manifolds, catalytic converters, and turbocharger connection in cars, motorcycles, or heavy machinery exposed to extreme heat and road shaking . Engineered with compliant specifications, these 8mm exhaust nut maintain moment integrity through thermal expansion cycles, outperforming standard steel fasteners in corrosive environments. Specifications: Maerial: brass Diameter: about 17.4mm/0.7inch Package Includes: 25pcs Exhaust nut note: 1.Please allow 1-2cm errors due to manual measurement, make sure that you do not mind before you order. 2.Due to the difference between different monitors, the picture may not reflect the actual color of the item.