Plain plug gauge with dia GO size 2.525 to 2.526mm & NO-G0 size 2.546 to 2.547mm. Gauge length for GO marking 2.756 to 2.760mm & NOGO marking 2.940 to 2.960mm - gauge for predrilling depth of hex of multiaxial screw shaft , Code - PPGWD 2525.2547