Precise Black Granite Parallels 2″ x 4″ x 24″

• 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