There are 2 styles of blades in wide use in power augers 1/ Cutting blades like the ones on hand augers and 2/ Ripper blades.
Strikemaster and Jiffy use both types depending on auger model.
Mine uses the ripper blades which stay sharp longer than the cutting type blades.
Until you hit a rock that is.
Only done that once.
The cutting blades cut through the ice faster but need sharpening more often.
Ripper blades are much better when you are drilling dirty ice or redrilling old holes.
Out West (Alberta, BC, Yukon, Alaska) there is a lot of dirty ice (due to glacial sediment) and this dulls cutting type blades very quickly.
Ripper blades reopen old holes with ease while cutting type blades tend to bind when breaking through.