Are you a serious professional wrench, or simply take your tools and work seriously? You have to consider investing in Park Too's DSD series Derailleur Screwdrivers. The DSD-4 Derailleur Screwdriver carries a tool steel quality 5mm precision ground flat blade that has an optimized shape and design for derailleur screw adjustment.

This precision component screwdriver has been machined to exact standards to ensure a perfect fit on compatible derailleur component fasteners. Featuring an ergonomic, CNC machined and hard anodized 6061 aluminum handle that has a slim profile, along with knurled grip zones, the flat blade DSD-4 Derailleur Screwdriver is an impressive tool that will last a lifetime, even in the busiest shop conditions.