Ruland torque screwdrivers are pre-set slip type tools that extend torque limiting action into a compact design. We offer five sizes of chrome plated alloy steel screwdrivers with pre-set torques ranging from 0.50 in-lbs (0.06 Nm) to 1.80 in-lbs (0.20 Nm). They are manufactured by Seekonk Precision Tools in Massachusetts with a proprietary internal mechanism that ensures hardware can not be torqued more than the factory preset. All torque screwdrivers come standard with NIST traceable certifications and are made in accordance with Federal Specification MIL-STD-45662A. Periodic calibration is required depending on frequency of use.