The Quad-16 Deep Well Impact Flip Socket Set Combines 16 Sae and Metric Hex Sizes In 4 Convenient Color Coded Sockets. Small 1/4 to 7/16-Inch (7 to 12 MM), Medium 1/2 to 11/16-Inch (9 TO14 MM). The Spring-Loaded Action Allows For Hands-Free Size Changes By Applying Pressure to The Smaller Socket to Compress It Out Of The Way. Compatible With Klein Tools' 1/4-Inch Hex Flip Socket Impact Shaft, These Quad Sockets Are A Compact and Convenient Solution For Any Job.