M3 螺丝与垫圈反晒杯头

motherboard and computer case screw
Counteunk/cup Head
常用机箱螺丝，M3沉头/杯头内六角
Build with solidworks2016.
STEP files.
The length can change freely.
长度可以任意调节

沉头螺丝 counteunk head screws
杯头螺丝 cup head screws
垫片 washer

This is the link to other motherboard com