2 pieces R-410A adapters included, converting 1/4 SAE male to 5/16 SAE female. Compatible with mini-split air conditioners, HVAC systems, and cooling service applications. Finger guard safety design: Features a finger guard to prevent the core tube of the air conditioning system from opening during operation, reducing the risk of refrigerant leakage and enhancing safety when in use. Brass construction: Made from brass for reliable durability. The adapters meet quality and performance testing requirements. Practical and safe design: Deep knurling on the coupling nuts allows finger-tight operation. The 45-degree angle at the service port location provides easier access, enabling comfortable and safe operation. use scenarios - On-site mini-split service: connects standard charging or testing hoses to R-410A systems with 1/4" SAE male to 5/16" SAE female ports. - HVAC maintenance and recharge: convenient for systems requiring a quick adaptation between 1/4" and 5/16" service connections. - Field diagnostics for residential or commercial units: facilitates safe and efficient coupling to service ports located in tight or angled spaces.