This file is used under the same conditions as the Howard Bone File. However, it has larger and coarser heads. One head is concave with the file side on the outer curve. The other head is flat and slightly angled. Overall length is 7- 5/8", head width is 1/4", head lengths are 3/4" (straight) and 1-1/2" (curved). Stainless steel, German made.