finely polished double open end metric wrench set Made of quality Cr-v material, higher torque, 30%higher than regular spannerbetter resistance to corrosionMade to US standard324106: 6pcs: 6*7,8*10,12*14,14*17,17*19,19*22324108: 8pcs: 6*7,8810,10*12,12*14,14817,17*19,19*22,22*24324110: 10pcs: 6*7-30*32mm finely polished double open end metric wrench set