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The Shopsmith Speed Increaser will turn your Mark V into an even more efficient routing and shaping tool than it already is... saving your time and giving you smoother, cleaner cuts. Designed for use with use with all Mark V Models (model 500, 505, 510 or 520), the Speed Increaser will deliver a full 10,000 rpm at your Mark V's "V" speed setting. As a result, you'll have to make fewer passes with your stock (especially when cutting full profiles)... and spend a lot less time sanding, too. The Increaser's under-table design also provides another advantage by allowing you to perform table routing and shaping operations in a more conventional fashion, with the bit cutting safely under your workpiece.