Topeak Bag Parts Compatible with all Topeak phone packs and the PanoComupter (EC1776). Mount fits 4-bolt Stem. Weight: 53g. Installation Range: 14-34mm. Dimensions: 3.3 x 1.7 x 0.7″. Extended bolts hold mount and faceplate. Angle-adjustable rotation for landscape or portrait viewing. Material: machined aluminum, engineering grade plastic. Low profile, compact design fits most stem faceplates and allows Topeak RideCases to be used on another bike.