Grade 30 Proof Coil Chains – China Lifting Slings, Webbing ...
Proof coil chain doesn't have a uniform pitch and does not work with windlasses. It is hallmarked approximately every foot with the manufacturer's symbol and grade marking: 3, 30 or 300. The typical uses of G30 proof coil chain include barrier chains, trailer safety chains, light construction, marine industry, etc.
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