gotta love the Gadget Girls...no affiliation but great rulers. Remember, HQ16 and maybe other midarms use 1/4" rulers and long-arms use 3/8". Workign with a ruler can be slower than expected (at least, my expectations! LOL) but I have found I really like using them. I've bought a bunch and use the straight (3x12) a lot as well as a smaller one with a notch for the hopping foot to control around applique. I also like the circular rulers as there is a lot that can be done with them.