9917MPR – FULLY POLISHED METRIC COMBINATION WRENCH SET. Fully polished drop forged alloy steel. V-groove design reduces wear on fasteners. 8mm Full Polish V-Groove Combination Wrench(991708M), 9mm Full Polish V-Groove Combination Wrench(991709M), 10mm Full Polish V-Groove Combination Wrench(991710M), 11mm Full Polish V-Groove Combination.