- galvanized iron mush-room head bolt
- 白铁: galvanized iron; tin plate
- 圆: round; circular; spherical
- 头: 5点就得动身 have to start before ...
- 螺栓: bolt; screw bolt; threaded b ...
- 半圆头螺栓: ahead bolt; ball headed bolt; ball stud; button headed bolt; button-headed bolt; cup head bolt; cup-headed bolt; half-round screw; snap head bolt; snap-head bolt
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