Made from class 35-40 cast iron.
All ends machined square and parallel within 0.002" per 6".
Ground finish - square within 0.0005" per 6" on the two working faces only.
Machined finish - square and parallel within 0.002" per 6".
Extra thickness and heavy ribbed construction.
Multiple 13/16" wide slots for many bolting and clamping possibilities.