<https://www.greenvill.co.uk/products/titanium-bevelled-ring-core-blank-with-screw-4mm-2mm-groove>
<http://schema.org/description>
"4mm Titanium Ring Core4mm width2mm insert grooveTitanium GR2Flat edges2 piece screw fitmentAvailable in UK sizes F to Z+1 (USA size 3 to 13) "
<https://www.greenvill.co.uk/products/titanium-bevelled-ring-core-blank-with-screw-4mm-2mm-groove>