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By certification 
(1) Standard:ASTM A193.
(2) Grade: B7/B7M, B16, B8/B8M.
(3) Size: M6-M100, 1/4"-4".
(4) Material: Alloy Steel.
(5) Surface: black, plain, zinc, zinc yellow, PTFE, HDG,etc.
(6) Packing: 1 less than 25kgs bulk into carton, then packed on pallet 2 Small box or color box, then into carton, then packed on pallet 3 As customers' request.
(2) Grade: B7/B7M, B16, B8/B8M.
(3) Size: M6-M100, 1/4"-4".
(4) Material: Alloy Steel.
(5) Surface: black, plain, zinc, zinc yellow, PTFE, HDG,etc.
(6) Packing: 1 less than 25kgs bulk into carton, then packed on pallet 2 Small box or color box, then into carton, then packed on pallet 3 As customers' request.
