Zippers #4573549

Mount Black model provides superior traction and braking safety against all kinds slide.-Core chain, 8 mm D profile cementation steel.-The strengthened wear bars.-Ring, 9 mm cementation steel.-Side chain, 8 mm cementation steel.-Heat treatment: 52-55 HRC surface hardness, 0.4-0.6 mm hardness depth, 34-36 HRC core hardness.-Surface treatmnet: Zincplated or painting.-Optimized for: Heavy duty skid or forestry chain.

A year ago at this time, Yosemite National Park was buried in snow. Chain controls on the park's roads kept many from visiting. But in the summer, the domestic and international tourist floodgates opened and the park ended up being visited by more than 5 million for the year, mind-boggling by any standard .