A swinging hammer is a hammer that is about one and a half meters long and has a flexible handle that is held with both hands . It appeared in mining in Germany in the second half of the 15th century , i.e. at a time when German mining was leading in Europe and was characterized by numerous technical innovations. He was able to transfer forces much better and had a reduced risk of bouncing. It was used to drive iron wedges into the rock and split it.