cheese-head screw round head screw round screw screw with round head
圆头螺钉;
cheese-head bolt round head bolt round head button bolt round-headed bolt
圆头螺栓;
cheese-head screw round head screw round screw screw with round head
圆头螺钉;
cheese-head bolt round head bolt round head button bolt round-headed bolt
圆头螺栓;
cup head screw half-round head screw machine screw with half round fillister head
半圆头螺钉;