Routers are to be used on a Hawkeye 1700 tail-boom or any other 20mm dia. tube to guide servo wires to the receiver. This decreases assembly time at the field as it is not necessary to thread the wires through the centre of the boom. It is recommended to use Velcro or tape to secure the wires at the rear of the fuselage to prevent the propeller from making contact with them during flight.ABS Infill - 50% Layer Height - 0.2 Weight - 0.5g