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By certification 
(1) Standard: ANSI.
(2) Grade: grade 2,grade 5, grade 8.
(3) Size: M6-M100, 1/4"-4".
(4) Material: Carbon Steel, Alloy Steel, SS.
(5) Finish:black,plain, zinc, HDG,etc.
(2) Grade: grade 2,grade 5, grade 8.
(3) Size: M6-M100, 1/4"-4".
(4) Material: Carbon Steel, Alloy Steel, SS.
(5) Finish:black,plain, zinc, HDG,etc.
