For standards of safety I agree to have this kind of protection because once underway it should not do so boastful as it is and remains a dangerous product because the dremel, does not lock, but this practical side is not the top, you have to work well in flat without being twisted in all directions (not like me) and it's hard to follow the line drawn as not visible enough in the protective housing without this little very good tool, easy to mount default (follow the instructions)