WELLBOLT CO.,LTD
Roof bolt sometimes called gutter bolt, or slotted mushroom head bolts, it's a full thread bolts, usually comes with square nut to protect the material you are fixing.
Wellbolt manufacture galvanized roofing bolt, hot dipped galvanized roofing bolt & stainless steel roofing bolt.
Size are mainly M5, M6, M8, 3/16", 1/4",5/16", etc.
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