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By certification 
1.The hook meets specification API 8A;
2.Special structure inside the barrel has supper performance on hydraulic buffering.
3.Main hook possesses dual safety device;
4.Main parts use high-strength alloy steel and all pass nondestructive test.
2.Special structure inside the barrel has supper performance on hydraulic buffering.
3.Main hook possesses dual safety device;
4.Main parts use high-strength alloy steel and all pass nondestructive test.
