a $10 to $30 value at NO additional charge!!!
Tire Chains Cams, on some truck chains when designated, assist with the proper tensioning of snow tire chains.
Each outer side chain has 3 or 4 cams. With the included cam tool, turn
each cam clockwise to the locking notch and take up the side chain slack.
cams pointed to by arrows above
the following applies
only to truck tire