Product name: 3/8 bolt extractor Size: 7.5*4*4cm/2.95*1.57*1.57 inches Plastic box packing size: 4.4*4.4*8.6cm/1.73*1.73*3.39 inches Our damaged bolt extractor works with different types of tools such as impact wrenches, ratchets, adjustable wrenches, sockets, and locking pliers, making it a flexible inclusion in any set of tools. Our stud extractor has a flexible size range and can accommodate bolts from 1/4 inch to 1/2 inch (6mm to 13mm), making it versatile for different uses, enabling you to efficiently extract broken or damaged bolts. Position the stud extractor on the stud and rotate the lower hexagonal nut counterclockwise to secure the jaws. When the jaws firmly grasp the damaged bolt or stud, proceed to turn the stud counterclockwise until it is extracted. Subsequently, release and detach in a clockwise manner. Please note that there may be slight wear on the threads due to the large amount of clamping force. Kindly allow for 1-3cm/0.39-1.19in variations in measurements due to manual measuring.