Review on Pro Tie 33720 Flexible Driver: Effortless Precision for Every Twist and Turn by Richard Nonya

This tool is well constructed and has made my life easier when changing the water pump, thermostat and hoses on my 335i. Easily penetrates hard-to-reach places and fixes clamps well. The reversible head is held in place by a friction ball and a spring, as is the case with screwdrivers with interchangeable bits. It's relatively easy to remove, but won't fall off unexpectedly.