Question

a grinder can catch on rough material edges and shift around, especially when using rotary bits called ______.
options (with radio buttons): burr bits, backing bits, kurt bits, saber bits

Explanation:

In the context of grinders and rotary bits, "bur bits" (likely a typo for "burr bits") are rotary bits that can catch on rough edges. The other options (backing bits, kurt bits, saber bits) are not standard terms for rotary bits that cause this issue.

Answer:

A. bur bits