All ends machined square and parallel within 0.002" per 6".
Extra thick ribbed construction.
Ground finish - square within 0.0005" per 6" on the two working faces only.
Machined finish - square and parallel within 0.002" per 6".
WARNING: This Product Can Expose You To Materials And/Or Chemicals Which Are Known To The State Of California To Cause Cancer And/Or Reproductive Harm.