EKLIND 91608 4 MM Ball-Hex (allen) ScrewdriverEKLIND TOOL cOMPANY is Americas leading manufacturer of high quality, industrial grade hex keys, made with pride in the USA since 1950 The EKLIND 91608 4 MM Ball-Hex (allen) Screwdriver meets the most stringent requirements of professional mechanics, tradespeople, do-it-yourselfers and hobbyistsFeatures..