the steel is .001 (or .002) on both edges, the alum is one edge only
not that it really matters, but my thinking is if both edges are flat
it's been better machined --and-- if one ever goes out, the other
might be good
It's the same extrusion as our current one - also a milled edge.
We claim straight to within .003" over the length of all sizes in aluminum.
Our first batch of aluminum straightedges was straight to within about .001"
though...of course - we're not going guarantee that....
Especially after UPS and FedEx get through with 'em, eh?
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