Shell reamer Application: For reaming through holes or blind holes. For attaching to holders according to DIN 217 (#SAPB2396695#). Especially for steel materials such as general structural steels, machining steels, tempered steels, case hardened steels, tool steels, high-speed steels, cast iron, spheroidal graphite and malleable cast iron, which can be used in non-ferrous metals such as aluminium and brass.