Qwark referred to his fists as the Fists of Justice, he would often utilize them in combat. Later Clank would emulate this while in his Giant Clank form.
When the Fists of Justice were equipped, Qwark would use his throwing weapon to attack at a distance, and Clank would use his Heli-Pack blade.
Qwark would use his fists to throw a Heroic Punch as his attack in Secret Agent Clank.
Qwark's fists were his melee weapon in Ratchet & Clank: All 4 One and Ratchet & Clank: Full Frontal Assault. Giant Clank also used this as a melee attack in Full Frontal Assault.