Review on NeoPRO Presta Valve Extension Extender Kit (Pack Of 2) W/Valve Key And Cap - Available In 4 Lengths - 20 by David Carmody

Will not fit Vittoria Presta valves. I put it on, pumped up the wheel and it just flew across the room. By threading it into the valve, a small amount of thread went further into the valve than the number of threads that would have held it in the valve. You could screw in further as if you stripped the threads, but you didn't strip them - they went too far to create a gap. Waste $$