... 气门调节圆头螺钉 valve adjusting ball stud 开槽圆头螺钉 slotted round head screw 内六角平圆头螺钉 Hexagon socket button head screws ...
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slotted round head wood screw 一字槽圆头木螺丝
slotted round-head tapping screw 有槽的半圆头自攻螺丝
slotted round-head self-cutting screw 有槽半圆头自攻螺钉
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