Tel：0631-8664868
Fax：0631-8664868
Sporting goods: Manager qiao 13706492052
Add：No.7 Baode Road, Wendengying Town, Wendeng City, Shandong Province
Standard bolt diameter
Length：18/20/22"
Inner Diameter：0.300"/0.283"
Straightness：+/-0.001，0.003，0.006
Weight torlance：+/-1 Grain
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