Convenience. The head can be rotated 20 degrees and the 20 degree rotation pattern allows for maneuvering in tight spaces for use in corners or tight places. Use: Easy access to those hard-to-reach places like corners or tight places. Or just use it as an extender for the drill bit holder. Wide applications for:Magnetic Pivot Drill Bit The drill bit extender set is designed with a 1/4" hex shank and a 1/4" extension chuck adapter. Fit for all inserts and 1/4 in. hex bits. The quick-release magnetic drill bit extension is great for extending all kinds of screwdriver bits, drills, nuts, batch heads, pneumatic screwdrivers, electric screwdrivers, pneumatic drills, manual screwdrivers, and impact drivers.