Aluminum Heat Sink for mounting fan on TOP for 540/550 bushed motor OR 3660/3650 Brushless motors.

Out Dia：39mm

Inn Dia：35mm

H：28mm（no fan）

W：30mm

Color：black/BLUE/RED/TI/ORANGE/PURPLE/SILIVER

Two Fans are optional ：8mm fans or 5mm fans（thickness）

JST extension wire is optional：JST Plug female 20/22/26AWG silicone wires, 60mm/100MM/200mm。