They're called Oetiker clamps. A cut-off wheel in a rotary wheel is a good choice; better still is the correct tool. One way, it squeezes the clamp on; turn it 90 degrees, and it cuts them off. Once you get used to it, it's faster and easier than regular screw clamps - and the clamps don't have sharp edges to cut yourself on. Holds better, too. With a bit of digging, you should be able to get one for $20 or so. I bought mine with an assortment of replacement clamps, and I use it all the time.BTW, how do you guys remove those one-time VW clamps? I use rotary tool to cut them.