Suitable for 3650/3660/3674 RC brushless motorWith good heat dissipation performance, a perfect water cooling jacket for motors.Made of high grade Aluminum alloy material, which is solid, wear-resistant, durable and eco-friendly.Novel appearance and exquisite workmanship.High upgrade parts for your rc boat.Inner Diameter: 36mm/1.42 inchLength: 50mm/1.97 inchWater Nozzle Outer Diameter: 5mm/0.2 inchWater Nozzle Inner Diameter: 2mm/0.08 inchMaterial:Aluminum alloycolour:RedPackage Contents:1 * RC Boat Motor Water Cooling Jacket Heat SinkOnly the above package content, other products are not included.Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.