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Accurate Screw Machine (english)
ASM - Variety of Precision Fastener Components
knurled head collar standard english
http://www.accuratescrew.com/catalog/knurled-head-low-profile-head-collar-standard

Accurate Screw Machine (english)
ASM - Variety of Precision Fastener Components
thumb-knurled-collared standard english
http://www.accuratescrew.com/catalog/thumb-knurled-collared-standard