StrikeMaster Mora Blade sizes

[Sprocket]

I have a used auger and want to get replacement blades for it.  Can anyone tell me how to measure the blades to get the correct size?

Thanks

[Gills-only]

OUTSIDE TO OUTSIDE THE BLADES!

[Sprocket]

Thank you Sir, looks like an 8" to me!

[bassandbucks1]

Some blades have the size stamped into them. It's usually on the back side, so you would have to remove one.

[Sprocket]

No stampings on my blades

Old Goat - thanks for the info, now I'm really confused.

My blades measure 3 5/8 on the back side (non-cutting edge side).  I"m guessing it's an older model based on the fact that the handle is welded to the bushing and there's no sign of a bolt hole, etc.

[Sprocket]

check your PM's and thanks for the info on the hole spacing, great to know.

FYI - StrikeMaster web site has 25% off - just ordered blades for 32 shipped...