Cone head drive screw with washer - used on roof for keeping fixing holes watertight.
锥头机螺钉垫圈-用于屋顶保持固定孔水密。
The lens has no internal AF motor and relies on a slotted drive screw operated by the camera.
该镜头没有内部马达，需要依靠机身的对焦马达驱动。
So, NIRVANA can say is the only true sense have speed of variable frequency drive screw air compressor.
所以，NIRVANA可以说是目前惟一真正意义上拥有调速变频驱动的螺杆空压机。
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