Cybecut Ceramic Ring 19.5mm Diameter 8mm Thread 3D
https://www.fabtechshop.com/shop/ccd19-5m8h12-5-cybecut-ceramic-ring-19-5mm-diameter-8mm-thread-3d-3707
https://www.fabtechshop.com/web/image/product.template/3707/image_1920?unique=a74fb85
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Out diameter: 20.6mm
Thread size: M8
Ceramic height: 13.5mm
Cutting type: 3D