Product review (4 stars): Great for a 14" wok, but very rough
I use this on a Thermador gas range, and it fits my 14" wok very well. It's not a perfect fit on the range, but it's close enough. And due to the abrasive texture, it doesn't slide around once it's in place.

The rough texture is also the down side, however. It really scratches the bottom of the wok. One reviewer said that he filed down the rough edges, which I could see working; however I just don't have the interest or patience (or file for that matter) to do that.