ISO 8325:2004 specifies methods for measuring the dimensional characteristics, neck strength and surface roughness of dental rotary instruments, such as burs, cutters, polishers, diamond and abrasive instruments. ISO 8325:2004 does not provide test methods for the characteristics of materials used for dental rotary instruments. NOTE For testing of these characteristics, see the respective product standards. ISO 8325:2004 is not applicable to dental root-canal instruments (see ISO 3630-1).