Backup wrench

 High-strength industry design, 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 pad