The Milwaukee 23-66-5380 Hammer Drill Switch is an electrical control component designed to regulate power activation in compatible hammer drills. It functions by completing or interrupting the internal circuit when the trigger is pressed or released, allowing the operator to start, stop, and control drill operation with precision. This switching action maintains consistent responsiveness and controlled performance during drilling tasks. Engineered for proper fit with specified models, it ensures stable electrical contact and reliable function. Its compact construction allows straightforward installation and replacement, making it a practical option for restoring correct trigger response and maintaining proper tool operation.