This is a very useful and inexpensive knife for reedmaking. I have used it for years and reckon it is the best all-round reed-making knife I have ever seen or used. The thin blade is great for cutting the scrape, shaping the tails, halving and cutting the lips.
The blade has twice as many cutting edges as a Stanley knife. Limited stock but currently available at http://www.kmbagpipes.com/rdmkg.html