The Park Tool DSD-4 Derailleur Screwdriver, click to enlarge

Item # DSD-4

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Derailleur Screwdriver

The Park Tool DSD-4 is a precision component screwdriver machined to exact standards to ensure a perfect fit on compatible component fasteners. Featuring an ergonomic, CNC machined and hard anodized 6061 aluminum handle and a 5mm precision-ground flat blade.

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DSD-4 Features

  • 5mm flat blade
  • Total length: 232 mm (9.1")
  • Shaft length: 145 mm (5.7")
  • Weight: 124 g (4.37 oz.)


  • DSD Review by David Rome Made in the USA, @parktoolblue is now offering a cross-tip screwdriver (DSD-2) built to the new standard. They also have a #4 flat blade to match. With machined aluminium handles, they certainly have a quality feel.

DSD-4 Derailleur Screwdriver (Flat Blade)