Heavy Duty Tubular Socket Wrench 1.High quality 40Cr-V steel drop forged 2.Surface: Treatment, fully polished chrome plated. Heavy Duty Tubular Socket Wrench1.High quality 40Cr-V steel drop forged2.Surface: Treatment, fully polished chrome plated, satin finished.3.Size: 6x7,8x9,10x11,12x13,14x15,16x17,18x19,20x22,21x23,24x26,25x28,27x29,30x32. Heavy Duty Tubular Socket Wrench