This is a silicone non-slip jar opener and trivet. The opener is designed with one rough side and one smooth side for easy firm gripping. Because it is made of silicone it sticks on metal and glass surfaces. It also serves as a trivet. It protects all surfaces including fabric table cloths up to 600 degrees Fahrenheit. Made in the USA; dishwasher safe. This jar opener and trivet is 6" in diameter.