The eye wrench combines two types of wrenches in one tool - on one side it has a flat wrench and on the other side an eye wrench. This combination provides greater versatility when tightening and loosening bolts and nuts. The flat end is used for quick engagement, while the eye end provides a better grip and the ability to apply more torque. The eye wrench is a popular tool in many industries, including automotive and engineering, due to its efficiency and ability to work in confined spaces.