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Made from 14 gauge steel, the J-clamp is made tough to handle the abuse of touring. The top is screened with user-writable tabs that are designed for wax pencil or can be more permanently designated with an indelible marker.
Installing it is easy. One simply unscrews the book-end outer shell from the desired Radial interface and slides the J-clamp over in place. The same 4 screws are used to secure the unit. The J-clamp features extended wings that are pre-drilled to allow quick installation on any flat surface.
Retail price is $30 USD.