Thank you for using our services. Out of the box our ContentBlock widget offers linking to Media modules (Images, Videos, Documents) and Pages.
The ProductsList widget would be the most suitable mechanism for linking product items, or alternatively you could open the product item in another tab and copy the link inside the ContentBlock.
Please do not hesitate to let us know if the above mentioned functionality does not suit your needs, we'll try to accommodate your request with a workaround if possible.
the Telerik team
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system and vote to affect the priority of the items