7.5cm in diameter. Waffle side needs to be facing the kiln element and I put it in place before heating up the kiln. Works a treat.
These Ceramic Firing Inserts are specially designed for firing metal clay in the UltraLite Studio Kiln.
Also used for safely drying metal clay in as little as 10 minutes - simply set your clay on one of the inserts and place on the kiln lid.
Sold individually. Each round insert measures 7.6cm
Also sold as a pack of 3 here.