RPM module kits include five modules in 200 RPM increments. Each kit is within a 1,000 RPM range. For example, the PN 8744 is supplied with: 4,000, 4,200, 4,400, 4,600, 4,800 modules.
MSD 8744 RPM Module Kit (4000 to 4800)
by NeweggConsumer Electronics
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