Bosch T-shank, 10 tpi.
Had to cut a 10" hole in the table top of a project today. Used an inexpensive Black and Decker saber saw (aka hand held jig saw) and one of these blades. The blade stayed right on the line, cut quickly and left a smooth surface, even using my cheap tool. I bought a pack of 5 for $10 at a local store, but I checked to confirm you can get them from Homedepot.com for a little less.
I realize this is a $10 item and its no big deal. But I was so pleased with this blade I thought Id pass it on in case it might help someone else.
Fred