ขายปลีกและส่ง ท่อกลมดำ ท่อกลมดำมอก.107-2533 มาตรฐาน astm, a53 เกรด a ท่อกลมดำขนาด Ø 17 มม. หนา 1.5 มม., 2.0 มม., 3.0 มิลลิเมตร ท่อกลมดำขนาด Ø 21.7 มิลลิเมตร หนา 1.5 มม., 2.0 มม., 3.0 มม. ท่อกลมดำขนาด Ø 34 มม หนา 1.5 มิลลิเมตร., 2.0 มม., 3.0 มม. ท่อกลมดำขนาด Ø 42.7 มม หนา 1.5 มม., 2.0 มิลลิเมตร

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