Flat end tight GB77 inner hexagonal capless screw top wire machine M3M4M5M6 inner hexagonal flat end tighter headless

 
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material:
carbon steel
Color Classification:
Milky white white beige light gray dark gray gray silver black orange rose red pink red lotus root watermelon red wine red khaki ginger yellow light yellow bright yellow apricot lemon yellow orange M3
standard type:
National standard
category:
set screw
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