The Arctic Aluminum Fan Adaptor designed to hold a 30mm cooling fan on the ESC to replace the factory fitted 25mm cooling fan. Aluminum made Arctic Fan Adaptor is a part of heat sink and light in weight. Easy installation with 4 screws to secure on the the ESC and 2 screws to secure the 30mm cooling fan. With the Arctic Fan Adaptor, a 30mm cooling fan can be installed to keep the temperature of the ESC effectively cool.