Backup wrench  High-strength industry design,Website:http://www.dudemachinery.com, scientific and safe;  All are mechanic, not hydraulic;  Lock structure is simple and easy to release;  Comfortable handle and skid-proof reaction arm;  Changeable working head, suitable nut range 19mm - 80mm;  Simple button enables to change working head quickly;  Can prevent the shaft from turning with nut, quite different from the old ones which needed a padMetric(mm) DCM19-27SDCM30-41SDCM46-60SDCM65-80SModelDC-19DC-22DC-24DC-27DC-30DC-32DC-36DC-41DC-46DC-50DC-55DC-60DC-65DC-70DC-75DC-80A/F19222427303236414650556065707580Standard size(mm)DCM-102SDCM-110SDCM-209SDCM-302SModelDC-120DC-014DC-100DC-102DC-104DC-107DC-110DC-200DC-203DC-206DC-209DC-212DC-215DC-302A/F3/47/811  81  /41  7161  5822  3162  3/2  9/162  3/42  15/163  1/8