Two-Piece Design: Two-Piece Design is easy to use, Maximum line aperture 0 =1.1mm, 100 pcs Rj45 plugs for unshielded twisted pair solid or stranded Cat 6 cable, details as picture showed. If you want pass through connectors, pls check asin: B099FFX1GG Chip technology: Pure copper chip. surface nickel plating, 24K gold-plated sontacts, more stable conductivity Environmentally Materials: Gold plated for Oxidation Resistance. Reliable data transmission is realized. More environmentally friendly PC material Pass Fluke Tested: The rj45 cat 6 connectors can pass the Fluke instrument test. Shrapnel strengthening bending is not easy to break