YA-0261BU Heat Sink with Twin Tornado High Speed Fans sets for 1:8 Motors with around 40.8mm diameter     Description: This heat sink comes with dual high speed fan for Motors with around 40.8mm diameter. The air-flows can be further enhanced by adding washers between the fans and the heat sink. On the other hand, you may install the heat sink without the washers to save space. Feature: For: 1:8 Motors with around 40.8mm diameter; 57.9mm length Material: Aluminum Color: Blue Include: Heat Sink - Big (1 pcs) Heat Sink - Small (1 pcs) M3 x 6mm Round Head Screws (4 pcs) M3 x 14mm Round Head Screws (4 pcs) M3 x 25mm Round Head Screws (4pcs) 10mm Washers (4 pcs) Tornado High Speed Fans - YA-0180 (2 pcs)