Flexible shaft makes it easy to reach tight spaces to get fasteners started. Perfect for those situations where you're trying to reach around a cabinet or enclosure and need to hold on to both ends of a fastener, and one of those spots is in a tight corner.
Features a quick release chuck for rapid bit change, and securely holds 1/4" bits in place. It can even hold shorter 1" insert bits, or can use it with a 1/4" to whatever size socket adapter.
You do lose some torque transmission from the flexible shaft, but when you need this tool hat's usually further down the list of problems.