Hello, Three questions: 1. Sold in pairs or singles? 2. Tapped for 10/32? 3. Are mounting holes 1/2 apart on center?

Thank you for the question. To answer your question in order: 1. This R0828-18 is sold as a single rail not as pairs. 2. This R0828-18 is tapped for 10/32 screws. 3. The gap between the holes is 0.62" centre to centre.
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