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