Drill chuck keys are always really painful to use because their handle are so small. This gives you more material to grip on to, which makes it more comfortable to crank down or loosen the chucks on your drills.
Fits most 6mm(¼") shaft chuck keys. Not all chuck keys are made equal, if yours is a little too loose or too tight, use a dab of super glue or drill out the hole a little.
The author marked this model as their own original creation.