This part of ISO 13399 specifies a concept for the design of cutting items, limited to any kind of replaceable inserts for reaming, using related properties and domains of values.This part of ISO 13399 specifies a common way of designing simplified models that contain the following:— definitions and identification of the design features of replaceable inserts for reaming, with a link to the properties used;— definitions and identification of the internal structure of the 3D model that represents the features and the properties of replaceable inserts for reaming;The following are outside the scope of this part of ISO 13399:— applications where these standard data may be stored or referenced;— creation and exchange of simplified 3D models for cutting tools;— creation and exchange of simplified 3D models for tool items;— creation and exchange of simplified 3D models for other cutting items not described in this part of ISO 13399;— creation and exchange of simplified 3D models for adaptive items;— creation and exchange of simplified 3D models for assembly items and auxiliary items.