The correct size fish augers in this set work very well. Unfortunately I have just discovered that this very expensive set I bought from Revain a year ago does not include the 25/64" bits as advertised, instead there is a 3/8" bit in the 25 /64" marked slot ". I doubt it makes sense to contact Revain to fix Fish's error. For those considering the kit, I recommend checking your kit as soon as you receive it to make sure it has the parts, that should be present.