The product model is: TZCN-86, length 86mm, inner diameter 10mm, hole depth 66mm. This model includes three parts: copper head, connecting nut, and locking tailstock. The copper head material is sintered copper particles, the link nut is brass, and the stainless steel locks the tailstock. Operating temperature range: -50~+120 degrees Celsius. The wall thickness of the product is 2.2mm, and the material is nickel-plated copper. The identification is very simple. You can see the true color of the copper with a light file. Again, remind buyers not to be fooled.