Features: *1. Brass construction, quick connection, good tensile strength, corrosion resistance and AC low-loss fitting. *2. Come with full swivel tip. *3. With 45 angle on the service port site for easier access. *4. It converts the 5/16 inch SAE charging-vacuum ports to accept 1/4 inch SAE gauge-hose set. *5. It is great fits for R410A mini split system air conditioners, HVAC and refrigeration service. Description: *1. Material: brass *2. Connectors: 5/16 inch female to 1/4 inch male SAE w/ valve core depressor *3. Thread Diameter: about 0.47 inch/ 12 mm *4. Thread Size: about 11 mm *5. Total Size: diameter: about 0.63 inch/ 1.6 cm, 2.09 inch/ 5.3 cm Package Includes: 2 x Adapter Notes: *1. R410A ductless mini split systems are usually equipped with a different charging port size to avoid charging of wrong refrigerant into the system (i.e. R22) *2. This new port size is 5/16 inch SAE and some gauge sets carry 1/4 inch SAE connectors. *3. Port adapter converts the 5/16 inch SAE ports to use with 1/4 inch SAE gauge sets. Return Policy All of our items come with a 30-day free return policy. If you need to return, please contact us, let us know the detailed problem and send us some pictures for confirmation. We reserve the right to refuse any returns for objective reasons. Shipping Policy All of our items are shipped free with tracking numbers. Orders will be shipped within 3 working days upon receipt of payment. Most orders will be shipped within 1 working day. In most cases, shipping takes 8-12 working days.