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Progression pins for vertical micro-cracks. They can be nailed with a hammer or placed as hooks in the irregularities of the blind cracks. When we exert a traction force on them, they tend to dig deeper into the rock.
Features:- Material: High resistance steel (Chrome-Vanadium) with anti-corrosion paint.
- Leaf measures 3 cm.
- Thickness: 4 mm.
- Weight approximately 47 g.