* 4x4x4" Precision ground and Angle Plate 90 degree

* 9 tapped thru holes 1/4"-20

* 4 tappd dead end holes on sides 1/4"-20

*  4 untapped thru holes 5/16"

* SOLID ONE Piece STEEL CONSTRUCTION. 

* HARDNESS: HRC58 TO 62

* GROUND FLAT, SQUARE AND PARALLEL TO ACCURACY: 0.0002"

* 1-1/4" thickness