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；
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.
镀镍12.8级的装饰性高强度螺栓，不仅外观有档次，而且安全有保障；
Nickel coating grade 12.8 high strength screws, safe and good appearance.
镀镍12.8级的装饰性高强度螺栓，不仅外观有档次，而且安全有保障；
Nickel coating grade 12.8 high strength screws, safe and good appearance.
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