方头螺钉的俯视图。
Side view of square head bolt with adjustable thread length.
螺纹长度可调整的平头一字槽螺钉的侧面图。
Mesh column connection with the use of semi-circular bolt head square neck, with anti-theft rings and washers, to prevent the separation can be artificially demolition.
网片与立柱的连接采用半圆头方颈螺栓，配以防盗垫圈，能防止隔离栅被人为地随意拆卸。
Mesh column connection with the use of semi-circular bolt head square neck, with anti-theft rings and washers, to prevent the separation can be artificially demolition.
网片与立柱的连接采用半圆头方颈螺栓，配以防盗垫圈，能防止隔离栅被人为地随意拆卸。
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