Sorry Yuccahead, I missed your original reply and question about the hacksaw blade.

As was already pointed out, the hacksaw blade is for use with the ferro rod that is epoxied to the back of the whistle, it works well. Schwert is correct that anything reasonably sharp will scrape sparks off the ferro rod. I did want something to scrape with within the mini-kit itself, so I included the hacksaw blade.

The hacksaw blade is also cut on an angle at the end and sharpened for use as a small blade. The hacksaw blade is carbon steel and used with the right stone (quartz in my area) will produce a spark. I remember an internet video that showed this (I thought it was Andrew Price on A-Z Bushcraft) but I cannot find it now?

Sorry about the "http" x 2 I am not much of a computer guy.

Mike