These are the Rod Guides w/nuts for the Traxxas Nitro Hawk Features: metal construction Includes: two rod guides and two nuts. Specifications: -Rod Guides, measures 13mm tall and the head diameter is 5mm wide Comments: The rod guides are used with the throttle servo horn, for operation of throttle and brake. NNA-1/12/93 BOX DIMENSIONS: 2.63" W. X .25" H. X 3.13" L. BOX WEIGHT: .01 LBS.