#### Answer

Estimate: $0$ inches
Exact: $\frac{9}{16}$ inches

#### Work Step by Step

From the table, we see that:
Third smallest pliers (8" lineman's) max jaw capacity=$1\frac{7}{16}$ inches
Smallest pliers (7" diagonal) max jaw capacity=$7/8$ inches
We find the difference:
Estimate: $1-1=0$ inches
Exact: $\displaystyle 1\frac{7}{16}-\frac{7}{8}=1\frac{7}{16}-\frac{14}{16}=\frac{23}{16}-\frac{14}{16}=\frac{9}{16}$ inches