Hex plug gauge with A/F GO size 2.525 to 2.526mm & NO-G0 size 2.546 to 2.547mm. Hex length for GO marking 2.508 to 2.513mm & NOGO marking 2.738 to 2.750mm - gauge required to check the hex of banks of multiaxial screw shaft , Code - HPGWD 2525.2547