General Tools Locking Contour Gauge #834X with Extra Long Pins, Profile Gauge, Shape Duplicator, 10-Inch (254mm), Precisely Copy Irregular Shapes For Perfect Fit and Easy Cutting

Minus 1 start because of magnets on back. I prefer if it did not have magnets. But if they are attached make them strong enough to hold this to a metal object. A metal slider would be better as to to not wear out on the back. Plastic pins work great. You can always push the pins into place from the other side if you are concerned about marking the wall. The lock works great. Very happy with tool.

Like the size. Seems large enough to do what I deal with. A little bulky but very helpful.

For the money it's fine but on this model the longer tines and locking mechanism make the movement of the parts more difficult. I tried removing one but then it's a little bit sloppy. It's almost as if there is one too many but not quite. I suppose you could sand one or two thinner but that's more trouble than a $20 item is worth. It does the job, just not smoothly

For the most part it's really good. There are one metal slide part on each side to keep/support the plastic ones. One side is very very stiff and difficult to slide. I can still use the rest just fine.

If you’re buying this too makes accurate cuts, don’t bother.