- round head rivets with small head-black
- 小半: less than half; lesser part; ...
- 圆: round; circular; spherical
- 头: 5点就得动身 have to start before ...
- 铆钉: rivet; clinch; clinch bolt
- 半圆头铆钉: brazier-head rivet; button head rivet; cup head rivet; half-round head rivet; snarivet
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