This is a great tool for any aircraft sheet metal mechanic who needs the usefulness of 1/4" x 28 female drill extenders but also may utilize "Boeing Style" quick change bits. These drill extenders are 5/16" shaft and can be chucked into a standard drill but also have the option of quick change style shaft. These extensions allow you to thread ¼ x 28 threaded drill bits, countersinks , etc. to extend your reach and/or quickly insert and remove from a quick change chuck such as #14135 .
Work quickly and efficiently with these quick-change extensions. The quick-change chucks allow you to simply slide the appropriate length quick-change shaft into the chuck, and attach a 1/4"-28 male threaded tool to the other end. You won't need to bother turning the chuck to get the bit in and out.
While this versatile drill bit extension set is designed for a quick-change chuck, you can also use it with a standard chuck with a capacity of at least 5/16".
Includes a 2.125-inch length, 3.5-inch length, and a 6-inch length drill bit extension.