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Font Sizes
Telerik Web Parts for SharePoint 2010 last build was R1 2023 SP2 and is discontinued since then.
Adding Font Sizes
You can populate the FontSizes dropdown by modifying the ToolsFile.xml / ListToolsFile.xml files, located in the following folder:
/Program Files/Common Files/Microsoft Shared/web server extensions/wpresources/RadEditorSharePoint/6.x.x.0__1f131a624888eeed/Resources/
For example:
XML
<root>
<tools name="MainToolbar" enabled="true">
<tool name="FontSize" />
</tools>
<fontSizes>
<item>1</item>
<item>3</item>
<item>5</item>
</fontSizes>
</root>
If you want to apply font sizes in pixels (px) or in points (pt) then use the Real Font Size dropdown.