What is a group of Drills called?

A group of drills is commonly called a Battery. Other collective nouns you may see include Regimen.

Collective nouns are a unique linguistic feature that helps us refer to a group of entities as a single unit. When it comes to drills, a few collective nouns can effectively depict various assembly types or drilling operations. In the context of tool sets or construction sites, "set of drills" is a generally used term to describe a collection of different types of drills designed to tackle diverse tasks. When it comes to very large-scale drilling endeavors, such as oil or gas exploration, the term "fleet of drills" is often employed. This collective noun likens the group of drilling machines to a fleet of ships, connoting the organized, collective effort required to search and extract valuable underground resources. Employed globally in resource-rich regions, a fleet of drills works in unison as a pivotal component of the extraction process. Moreover, during construction projects or when many drills are operating simultaneously, the term "cluster of drills" is frequently used. This collective noun evokes an image of multiple drills strategically positioned in a confined or designated area, functioning harmoniously together to carry out an important task, such as drilling holes, forming tunnels, or securing foundations. Collective nouns play a significant role in crystallizing common textual references to groups of drills, providing a succinct and imaginative means of expression within the realm of dexterity and construction tools. Whether it's a set, fleet, or cluster, these terms efficaciously capture the essence of collaboration and amplify the impact of drilling activities across various industries.