Holubar brake bars fit the old standard-size aluminum oval and D carabiners. They are not milled from round rods, but rather from a custom extrusion. The resulting bars are not as tall as round bars, but have similar rope contact areas. They are also deeper, providing a stronger notch.
- Thee left-hand bar has three flat surfaces. It superficially resembles some of the CMI brake bars, but is not nearly as deep.
- The front and rear faces of the right-hand bar are both curved. Curving the rear face serves no useful purpose. Tool marks on the top and bottom faces show that these were turned flat in a lathe.
Both bars are plain aluminum.
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