These heavy-duty drive shafts flex through 90 degrees (or more depending upon the length) to help you reach those “inaccessible” screws easily. Unlike other “flexible extension shafts”, the outer cover of these extensions does not rotate, so you can hold it as needed to direct it into position, and you don’t need to worry about it grabbing hold of something unexpectedly. Just imagine how nice it would be to snake one of these flexible extensions deep into an appliance and remove a screw without taking half of the machine apart first! Torque capacity of 156 inch-pounds is almost twice as much torque as a #10 screw can take! Standard 1/4" ball detent drive end fits most quick-change chucks. The mag-bit holder female ends accept both 1/4" ball and wire detent tools and bits. Made in Taiwan.