General Die & Engineering Since 1971, General Die & Engineering has been building robust tooling the thoroughly meets and exceeds customers' standards. Our wide ranging capabilities include: Die Cast Dies. Coining Dies. Trim D Since 1971, General Die & Engineering has been building robust tooling the thoroughly meets and exceeds customers' standards. Our wide ranging capabilities include: Die Cast Dies. Coining Dies. Trim Dies. Plastic Injection Molds. Thermoset Molds. Aerospace Hot Form. CNC Machining.