The CDI Torque Wrench Head is the perfect accessory for your torque wrench. The interchangeable head is compatible with most popular models of torque wrenches. It has a 3/8 in. drive size and 4-point measurements, with an overall length of 3 1/16 in. Its square ratcheting head allows you to adjust fasteners without having to reposition the wrench. The CDI Torque Wrench Head is a reliable tool that will help you work faster and more efficiently when tightening nuts and bolts.