one set of interchangeable torque wrench handle 9x12 mm shank size range 10 100 nm with interchangeable open ended heads of shank size 9x12 mm open size 16mm 17mm 18mm 19mm 14mm 1 5mm one set consists of one interchangeable torque wrench handle 6 nos of interchangeable open ended he ads valid calibration certificate must be provided warranty period 12 months after the date of delivery