Precision female square drives to facilitate testing of hand & power tools Heavy-duty stainless steel allows 140% overload capacity Accuracy is better than +/- 1% Indicated Metrology Stationary Td Designed to fit ANSI, BS, & DIN square standards Zero Drift of less than .1% rated torque per degree Celsius Warranty covers 1 year parts & labor on manufacturing defects Specifications: Base Dia - in: 3-15/16 Drive Size - in: 3/4 Height - in: 4-7/16 Max Torque - ft lbs: 400 Max Torque - Nm: 540