Awl w/30-degree Bend and Hook

The 30-degree bend with hook is the purpose-built awl for internal cable routing. Internal-routing frames have replaced external cable stops on every modern road and gravel build, and the housing has to be fished through the frame from one exit port to another. The 639D's hook catches the housing end inside the tube and lets you pull it through to the exit. No magnet, no string, no shake-the-frame routine.

The hook works because the 30° bend keeps the hook tip aligned with the housing's approach direction. A 90° hook would catch on the inside of the frame; a straight tip wouldn't catch the housing at all. The 30° geometry is the angle that lets the tip slide past internal cable guides and then catch on the housing once it's past.

The 639D is 165 mm overall with the hook formed in hardened tool steel. The hook is shaped to grab a 4 mm or 5 mm cable housing without tearing the housing's outer cover; important because a torn housing end won't seat in the frame's exit grommet.

What the 30° hook does best

• Fishing internal-routing housing through downtube exit ports, top-tube ports, seat-tube ports
• Catching a brake-hose end inside the frame after the hose has been threaded but stalled at a routing change
• Hooking out an electronic shifting wire that's snagged behind an internal frame stop
• Pulling a derailleur cable past a stuck guide when the cable's end is past the guide but not yet at the exit

For other approach angles, see the 639A straight awl, the 639B 90° bent awl, or the 639C S-bend awl. Each handles a different geometry; the 639D is specifically built for internal routing.

Specs

• 165 mm overall length
• 30-degree bend with hook in hardened tool steel
• Composite ergonomic handle
• Article number: 639D

Built in Zreče, Slovenia

Unior has been forging hand tools in Zreče since 1919, and is the official technical partner of multiple World Tour and downhill teams. The hook geometry on the 639D is the most-recently added to the 639 family, added specifically as internal-routing frames spread from premium road into the broader catalog. Same hardened tool-steel stock as the rest of the 639 family; the bend and hook are formed and tempered after the heat-treatment of the parent shaft.

Pro tip from our mechanics

A piece of fishing line with a knot tied at one end is the budget version of the 639D, and most mechanics start there. The hook awl is faster on every successive routing job, and the time saved over a working week pays for the tool quickly. Our workshop hand tools guide covers the awl line and the rest of the workshop hand-tool layer: Workshop hand tools every bike shop needs →