I was just checking the Snap-on online catalog and the SPP744 is gone.
For those not familiar it is used to retain the ball and spring that actuate the pawl. Replacing the pawl without the tool is an adventure and with it pretty simple.
I have one but wanted to get a a couple more for some friends. If you come across one in your travels snag it if you need to rebuild a ratchet you'll be glad you have it.
Not my pic but this is what it looks like.