Thurmer Tools 1932Z01 is an HSS countersink set supplied in a metal cassette. The set contains six cross-hole deburring and countersinking tools sized 6.3 mm, 8.3 mm, 10.4 mm, 12.4 mm, 16.5 mm and 20.5 mm. It is used for deburring drilled holes and preparing chamfers in steel, non-ferrous metal and plastic.