The answer to this question depends largely on the species of fish you’re after. You don’t want to hook a trophy fish only to lose it at the last minute because you can’t pull it through a too-small hole. For trout and panfish, a 6-inch auger should be just fine. An 8-inch auger is good for larger trout and bass. A 10-inch auger is a must-have if you’re targeting big lakers, pike, and musky through the ice.