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The new Patented Viper-1® Drive On Rail Anchor from Lewis Bolt & Nut Company is a dramatic improvement over standard Drive on Anchors in use today. The bearing surface is approximately 75% greater, as well as slightly lower on the tie which helps prevent, or eliminate resulting tie degradation. In addition, the Viper-1, has considerably higher holding power, and can be removed and re-applied multiple times while maintaining its original attributes. Considering Life Cyle Costs, The Viper-1® is hands down, the best anchor on the market today.