Flexible Shaft Bit Extension for Screwdriver - 8-1/2" long - brand new, never used - $10 firm PRODUCT DESCRIPTION: 8-1/2 inch Flexible Shaft Bit Extension is good for using under cabinets, drawers and in narrow areas where you need to drive screws. The shaft flexes to a full 90 so you can get at hard to reach places. Bit holder with a 1/4 inch hex shank.