If you consider these clamps you can be assured that they work fairly well and there really are no other products of this type on the market that I know of. They even come with a drill. I've used mine about two dozen times now and always with great results. I think these clips are one of the little trade secrets in making kitchen cabinets. You simply align the face frames, position both clips where you want them, then drill a pilot hole using the guide built into the clip. Then rotate the rail out of the way and screw in a 2 1/2" Narrow Head Deck Screw. I used the Stars which cost about $12 a hundred and they were worth it. And here's another tip. Dive in pre-tighten the screws in wax paste to prevent threads catching on hardwood (assuming you are working with oak, maple or cherry hardwood) Great product and get it now and you will love it.