Editing Aid climbing (section)

===Fixed placement equipment===

Before the introduction of clean aid climbing, placements were [[rock climbing hammer|hammered-in]] by the aid climber as they ascended, with metal [[piton]]s hammered into cracks being a common placement (and the various piton types including [[Lost Arrow]]s, [[Bong (climbing)|bongs]], [[Piton#Styles and shapes|angles]] and [[knifeblade]]s), but also including [[Copperhead (climbing)|copperheads]] (or heads); aid climbers may also use bolt kits to place fixed [[bolt (climbing)|bolt]]s where there are no suitable cracks for pitons while ascending.<ref name=MFOH15/>