Park Tool Derailleur Screwdriver – DSD The Derailleur Screwdriver – DSD from Park Tool is a long-reaching driver, designed to guarantee a perfect fit with compatible fasteners when you are removing and installing your derailleur. The ideal screwdriver for the professional mechanic. Precision Crafted Professional Screwdriver Machined to exact standards for an accurate engagement with suitably sized components, the Derailleur Screwdriver – DSD features a 5mm precision ground flat blade or cross tip at the tip, manoeuvred by an ergonomic handle made from CNC machined and hard anodised 6061 aluminium. This construction makes for a durable and lightweight screwdriver that can easily get to hard-to-reach fasteners as you carry out your necessary maintenance. Features: Material: CNC Machined, hard Anodised Aluminium Head Size and Type: 5mm precision-ground flat blade or cross tip Buy Park Tool Workshop from Chain Reaction Cycles, the World’s Largest Online Bike Store.