Materials :Zinc alloy lock, nuts, zinc plated steel boards and steel bolts.
材质：锌合金锁体、螺母、镀锌钢板钢栓；
The bolts are made from excellent quality alloy steel, the nuts and washers are made from carbon steel, cheese head studs for stud welding are made from ML15AL.
螺栓选用优质合金钢，螺母、垫圈选用优质碳结钢，圆柱头焊钉选用ML 15al。
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