CDI CDI S Hook - 2000-151-4 The CDI 2000-151-4 is a S Hook expressly designed to calibrate the complete line of Torque Transducers From Snap-On Industrial Brands. $10.16 $19.93 Add to Cart No one manufactures and sells more professional-grade torque products. We are the world’s largest supplier of industrial quality torque tools, and a respected leader in precision torque, force and tension calibration systems. CDI is ISO 9001 certified and a pioneer in the development of digital torque measuring instruments. So whether it’s torque wrenches and drivers or torque testing and calibration equipment, all meet the most exacting standards. CDI Torque Products: torque without compromise.