Premium Quality - OTAUPRS TR545D valve stems feature brass construction with precision nickel plating, offering superior strength and corrosion resistance compared to aluminum alloys! Smoothly polished surfaces and edges ensure scratch-free handling. The included ozone-resistant viton rubber o-ring. Compared with natural rubber, viton rubber more resistant to oxidation. Precision Dimensions - This 18-pack of 60 degree TR545D semi tire valve stems is engineered for 9.7mm-10mm (0.382"-0.394") rim holes and seamlessly compatible with Alcoa 22.5" and 24.5" aluminum wheels.Designed as an exact-fit replacement for OE part number TR545D, the 60-degree angled valve stem ensures effortless installation and removal. Safety Certified - Each TR545D semi truck valve stem is 100% air-leak tested to withstand 200 PSI, rigorously meeting SAE J1205/J1206 safety standards. The brass core guarantees zero leakage for safer driving. Effortless Installation & Maintenance - [Installation] Slide the bolt into the rim hole, secure the metal nut from the backside, and tighten. [Maintenance] Includes 3 extra brass cores, 3 O-rings, 3 nuts and a 4-way valve core tool for quick repairs. Universal Compatibility - These 60 degree heavy-duty high-pressure valve stems work with most heavy duty vehicle, such as trucks, semi-trucks, tractor and buses. (ALWAYS verify sizing using our product chart before purchase). OTAUPRS Truck Tire Valve Stem, TR545D 60 Degree Valve Stem, Clamp-in Heavy Duty Tire Valve Stems, Semi Truck Valve Stems for 22.5 & 24.5 Alcoa Aluminum Wheels, High-Pressure valve stems for Truck and Bus Tires