1. Closed end crimp cap connectors with internal tin-plated copper tube to ensure perfect connections between wires. 2. UL approved Nylon PA66,inner material is copper or aluminum 3. Air tool QUICHER HS-30 or Muromoto Tekko MR-30A 4. Just strip of the wire and insert securely inside the connector crimp by crimping tool. 5. Pass750c and 850c temperature test fromTUV 6. Produce ability:1,000,000pcs/day,also have stock. 1000pcs/bag,20000pcs/carton 12.236KG/carton.