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Accurate Screw Machine (english)
ASM - Variety of Precision Fastener Components
flat head, hex socket standard english
http://www.accuratescrew.com/catalog/flat-head-hex-socket-standard

Accurate Screw Machine (english)
ASM - Variety of Precision Fastener Components
flat head, socket pin standard english
http://www.accuratescrew.com/catalog/flat-head-socket-pin-security-standard