Steel Tec is a metal construction toy similar to Meccano. It used a combination of metal and plastic parts held together by metal screws.
It was manufactured in China by the Azrak Hamway International, Inc. from 1992 to 1997. The rights are currently held by JAKKS Pacific, Inc.
Unlike Meccano (up until recently), the screws did not use a regular screwdriver, but an allen key. Sometimes the manufacturing tolerances were poor, and the screws were hard to use.
References
Steel Tec Wikipedia(Text) CC BY-SA