Narishige's X-4 X-blocks are for combining two bars in the same plane. Users should select the required block according to the bar size, and whether features such as a rotation mechanism are desired. The X-4 is the most versatile. It holds 2 bars, and each can be up to 12mm or down to 4mm, and they can be rotated with respect to each other. A less versatile but less-expensive option is the UX-10-10. To see other options, type "x-block" into the search box on any of our web pages.
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