There are Two installation positions available, low and high. Each depends on which way you slip on the fork collars. Product Details Condition: 100% Brand New Material: Aluminum T6061 Surface: CNC & Anodized Quantity: 1 pair (left and right). Clamp Size: 50mm Clamp Bars diameter: 7/8" Bar Bars Length: 305mm?12"), Length adjustable Package Includes: A pair of Clip-ons handlebars Features: 1.Two-piece clamp design for an easier install and Removable 2.Two installation positions available, low and high. 3.Adjustable length on the handlebar. 4.Good manipulating and stability at high speed 5.No instructions included.Professional installation is highly recommended! If you are not sure that size, please check the size carefully before making payment.