These modular plug connectors are used in making telephone and networking cables.
Each connector come with gold plated contacts.
There are several types of modular connectors available below.
 Order# |  Fig |  RJ  |  # of Positions x # of Contacts |  Type           |  Cable   |  Crimping tool |
 70-020 |  1 |  10 |  4 x 4 |  Handset |  Flat |  70-0314 |
 70-025 |  2 |  11 |  6 x 4 |  Wall Jack 4 x 6 |  Flat |  70-0315 |
 70-030 |  3 |  12 |  6 x 6 |  Wall Jack 6 x 6 |  Flat |  70-0315 |
 70-035 |  4 |  45 |  8 x 8 |  No-Key 8 x 8 |  Flat |  70-0317 |
 70-618 |  3 |  12 |  6 x 6 |  Solid Wire 6 x 6 |  Round |  70-0315 |
 70-619 |  4 |  45 |  8 x 8 |  Solid Wire 8 x 8 |  Round |  70-0317 |
 70-619A |  4 |  45 |  8 x 8 (Shielded Case) |  Solid Wire 8 x 8 |  Round |  70-0317 |
 70-625 |  4 |  45 |  8 x 8 |  Stranded 8 x 8 |  Round |  70-0317 |
 70-620 |  5 |  48 |  10 x 10 |  Solid wire 10 x 10 |  Round |  HT-2092 |
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The best standard combination for making computer networking of Cat5E or Cat6 cable is the modular plug 70-619 and using modular crimping tool 70-0317.