This is the Cooling Fan for the Reedy Blackbox 510R Competition ESC.                                                                                       FEATURES: Fastens to top of ESC to cool internal components                                     Slight taller than the #27028 Cooling Fan-for installations where space above the ESC is not limited                                                  Preattached wire lead and connector                                                                                                                   INCLUDES: Cooling Fan with Wire Lead and Connector                                               Four 2.5 x 12mm Screws                                                                                                                                SPECS:    Dimensions: 1.2 x 1.2 x 0.39" (30 x 30 x 10mm)