This is not the fettling tool we remember from the heyday of ceramics, the original tool was double edges and was originally red. I believe it later came out in blue. It was injection molded and perhaps the mold has been lost...
This tool works great it will not scrape the plaster off your molds. Proper mold fettling makes the greenware cleaning easier.
WARNING: This product can expose you to chemicals including Silica, crystalline (airborne particles of respirable size), which are known to the State of California to cause cancer. For more information go to www.P65Warnings.ca.gov.