Hand-held knockout punch driver

A hand-held knockout punch driver comprising:

• a housing;
• a motor positioned within the housing;
• a drive assembly at least partially positioned within the housing and including an output member movable relative to the housing;
• a head unit removably coupled to the housing, the head unit including
• a body,
• an input member movable relative to the body, and
• a draw rod to which at least one of a punch or a die is attachable, the draw rod configured to move axially relative to the body in response to movement of the input member relative to the body;
• and
• a quick-release mechanism configured to removably couple the head unit to the housing,
• wherein the output member is configured to engage the input member such that the input member moves relative to the body in response to movement of the output member relative to the housing, and
• wherein the body is engageable with the quick release mechanism separately from the engagement between the output member and the input member.