This change is a design improvement to Diego Elite Burrs MDSSA, MDASA, MDSLA, MDSTAP, MDALA to improve the ease of Burr loading and release. This involves a change of material from 304 Stainless Steel to 17-4 Stainless Steel and 300 SERIES Stainless Steel to 17-4 Stainless Steel. These parts have no direct patient contact.