When working in difficult, tight spaces, universal joints come in handy. The unique professional feature of AutoFlex™ solves the biggest issue with traditional universal joints. Traditional universal joints tend to move and flop into positions that make it hard to get onto the fastener. AutoFlex™ introduces a spring-loaded design which prevents joints from "falling" to one side and eliminates the need for tape to hold the U-joint in place. The AutoFlex™ design allows one hand use and is perfect for hard-to-reach areas. Constructed of chrome-vanadium steel for exceptional strength and longevity.