Reamers are primarily used for which of the following purposes?

Reamers are primarily used for smoothing and enlarging existing holes to achieve a precise diameter and a better surface finish. Their design features multiple cutting edges that refine the hole's walls, removing small amounts of material and ensuring that the hole meets specific dimensional requirements. This makes them ideal for achieving tight tolerances in applications where the accurate fit of a fastener is crucial.

The other options do not accurately describe the primary purpose of reamers. While drilling new holes is typically the function of drill bits, reamers focus on modifying existing holes. Cutting threads is done by taps or specific threading tools and is not within the scope of a reamer’s function. Sharpening tools, on the other hand, is the task of specific sharpening devices, not reamers, which are solely dedicated to hole modification.