Precise 4 Face Black Granite Parallels1″ x 2″ x 12″
Precision ground in pairs
Can be matched in matched pairs with two faces or four face parallel
Grade A. Flatness and beeline of measuring surface 0.00005/6, parallelism of the two measuring surfaces 0.00005/6, perpendicularity between measuring surface and side surfaces 0.0008 /4, height difference of the parallels within a matched pair 0.00005/6
