The PNW Components Pine Dropper is easy to install and provides dependable up and down actuation. The sturdy coil spring system and tidy external routing at the mid-cap deliver smooth, secure action. The simple design makes for easy servicing and consistent performance. This dropper post operates flawlessly and doesn't break the bank. FEATURES: 27.2mm diameter is compatible with gravel bikes, classic hardtails & more A lightweight sealed cartridge that controls the damping of the post The cable attaches at the seatpost collar (Externally) 2-bolt micro adjust head Compatible with all PNW dropper levers and most other brands too (lever kit sold separately) Coil spring SPECS: Travel Drop: 90 or 110mm Diameter: 27.2mm Routing: External Cable Routing Only Seatpost Material: 7075 Alloy Stanchion Diameter: 22mm