The Norbar Model 5 Torque Wrench is highly accurate with interchangeable 1/4in hexagon bits. (ISO 11731988 Form C drive bits). The Model 5 is non-length dependent and remains accurate regardless of hand position. Supplied in a storage case that allows space for the storage of additional drive bits and optional stepless ratchet. Supplied with a declaration of conformance to ISO 67892017. Specification Drive 1/4in Female Square. Range 1-5Nm. Torque Radius 101.6mm. Ratchet Teeth None. Ratchet Type Stepless. Length 170mm. Weight 0.12kg.