Hex plug gauge 1.5MM,A/F - Hex. Plug Reversible double sided GO Gauge -1.507mm to 1.509mm A/F and GO Length - 1.003mm to 1.005mm, Nogo Length - 1.095mm to 1.100mm (Required Check The HEX Slot For 2.00 Cortex Screw HPG1507.1547.1000.1100