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The earliest screwdrivers of which written evidence remains were used in Europe in the late Middle Ages. It seems that they were probably invented in either Germany or France, in the late 15th century. The tool's original names in German and French were Schraubendreher (screwturner) and tournevis (turnscrew), respectively, reflecting the native linguistic patterns of Germanic and Romance languages. The first documentation of the tool is in the medieval Housebook of Wolfegg Castle, a manuscript written sometime between 1475 and 1490. These earliest screwdrivers had pear-shaped handles and were made for slotted screws (diversification of the many types of screwdrivers did not emerge until the Gilded Age). The screwdriver remained inconspicuous, however, as evidence of its existence throughout the next 300 years was based primarily on the presence of screws.

 Types of head vary, and can be identified below.

Manufactures of electronic equipment use hard to obtain, or even redesign a screw head to limit ones access to the inside of their products. The Iphone is protected by a Pentalobe and equipment like the Nintendo WII use a Tri Wing

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John Christensen 

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