General description These 2pcs 36mm RC Motor Heat Sink Cooling Jackets are designed for 3650, 3660, and 3674 brushless motors, providing excellent heat dissipation performance. Made from high-quality aluminum alloy, they are solid, wear-resistant, and environmentally friendly, making them a perfect upgrade for your RC boat. Technical specifications Inner Diameter: 36mm / 1.42 inch Length: 50mm / 1.97 inch Nozzle Outer Diameter: 5mm / 0.2 inch Nozzle Inner Diameter: 2mm / 0.08 inch Material: Aluminum Alloy Color: Red Measurement allowed error: +/- 1-3 cm Package contents 2 x RC Boat Motor Cooling Radiator