RayTools Ceramic Ring 28mm Diameter 11mm Thread 2D
https://www.fabtechshop.com/shop/xp-cer00-0005-120515099a-rt-31220000002-raytools-ceramic-ring-28mm-diameter-11mm-thread-2d-2477
https://www.fabtechshop.com/web/image/product.template/2477/image_1920?unique=e13a163
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Out diameter: 28mm
Thread size: M11
Ceramic height: 12mm
Cutting type: 2D