Hex plug gauge 3MM,A/F- i.)  Hex. Plug Reversible double sided GO Gauge -3.023 to 3.025 A/F and GO Length 2.805 to 2.810, Nogo Length 2.995 to 3.000 mm      (Required Check The HEX Slot For M6 Grub Screw (F0101.3040.01)   HPG3020.3080.2800.3000