The decorative upper cover and the lower bottom are at least provided with two pairs of fixing screw holes which are connected by screw bolts.
所述的装饰上盖与下底上至少设有两对固定螺孔，其间采用螺栓连接；
Screw the fixing ring nuts back on.
拧紧背面的固定环型螺帽。
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。
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