This part of ISO 6360 presents a number coding system for rotary instruments and accessories and gives some guidance with regard to its interpretation and use. This part of ISO 6360 specifies the code numbers for materials used for the working parts of instruments, the coating and the binding of abrasives for instruments. The three-digit number forms the first group of three digits in the locations one to three of the 15-digit overall number. This part of ISO 6360 further specifies the code numbers for shanks, handles, or bore diameter of unmounted instruments, and for the overall lengths of instruments. The three-digit number forms the second group of three (two plus one) digits in the 15-digit overall number. In Annex A several examples of complete 15-digit identification numbers are given to demonstrate the number coding system, including examples for the three (additional) optional digits (16 to 18) for diamond instruments.#,,#