In reply to Richard Carter:
Richard, word of advice, as I've just sold a set of these to someone in my cycling club. They come in different drop lengths and the ones I had were to replace factory fitted calipers on my winter bike - however there wasn't enough adjustment for the pads to fit properly onto the rim, they were too close to the edge of the rim/tyre wall. The measurement will help people decide if they will be right for their bike.
HtH
Sam