Using the 225 Flex Shaft attachment removes the weight of the tool from your hand and allows for precise and delicate movements. For best results, start at the centermost part of the egg and work outward. The 545 diamond wheel is a very thin, fine wheel. It is used most successfully at speeds less than 20,000 rpm. Faster speeds may cause the wheel to get too hot and bend under pressure. Engraving cutters 111 and 106 need a 481 collet.