Super Torque 647C/649B - Opti Torque 649B/C and 650B/C. Replacement rotor autochuck mechanism with "motion activation" technology. The front of the spindle has a smaller diameter to accomodate the air dam for the 647/649 or 650 models (available here). The spindle housing has been further improved by hardening the steel to withstand numerous rebuilds and overhauls. Each rotor is serialized and carries a 6-month warranty. Made in USA
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