A hard steel piton ideal for use on hard rock (granite/Schist/rhyolite) in medium size cracks. 

 

Angle Pitons generally fit larger cracks than Lost Arrows, but there is some overlap. 

 

Whereas Lost Arrows are defined by having a solid forged body Angle pitons are formed by folding steel sheet into a "U", "V", or "Z" shape to create a body with some spring that helps it grip the sides of the crack. Angles work well in finger to small hand sized cracks where the steel deforms elastically as the piton is placed. They also work well in pods or pockets where a small cam won't quite work. Its angular shape helps give these pitons excellent extraction strength.

 

It is normal to carry an assortment of full-length angles along with some thin slings to tie them off in shallow placements and so reduce leverage and provide more security than a wobbly nut or cam.