Features: Environmental protections coppered terminals wiring hole is large, tight pressure line, wiring / change line convenient PVC environmental protections shell oil resistance, pressure resistance, shell can be repeatedly disassembled for recycling. In accordanced with industrial standards, strong contact, stable transmission, resistant to insertion and extraction. 9-pin universal solderless: 9-pin serial head universal RS232, RS485, RS422 and other various db9pin type communication. Full compatibility 9-pin serial header is compatibles RS232, RS485, RS422, and a variety of db9pin-type communication fully customizable. Can be customized to make a variety of db9pin serial lines, 485 lines, 422 lines. Specifications: item：2Packs db9pin Serial Adapters Component: Metal and plastic Size：about 4.9x3.4x2.05cm/1.93x1.34x0.81in Package Option: Male Plus Screw /Male Plus Nut/Female Plus Screw /Female Plus Nut Quantity: 2pcs Package Includes: 2Packs db9pin Serial Adapters note: There might be a bit color distortions due to different computer resolution There might be size errors due to different computer resolution