1/4" Hex Flexible Shaft

Working on the premise that there is always at least one screw on every job that is almost unreachable, here is a really good flexible drive shaft, 260mm long, with a spirally wound steel shaft which easily bends up to 90°. It has a 1/4" hex female at one end and a 1/4" hex male at the other and a free running collar just behind the business end. We have yet to see anything better.