For medium power transistors, LED and photosensitive device package, specially for military items Features: 1) Cap and head for TO-18, TO-39, B-1, B-4, TO-5 2) With good airtight joint 3) Material options:a) Nickle 99.2 - 99.4b) Steel nickle clad 3 - 6 microc) Steel electroless nickle plated 3 - 6 micrond) Gold plated by selection4) OEM orders acceptable