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Knurled Nuts อุปกรณ์ขนาดเล็กที่มีความสำคัญในงานช่าง
Knurled Nuts ?????????????????????????? ??????????? ??????????????????? ???????????????????????????????? ??????????? ????????????? ?????????????????????? ??????????????????????????????????????? Knurling ?????????????????????????????????????????????????? ???? ???????????????????????? ?????? ????????????? ?????????????????????????????? ?????????? ???