I bought this "Dremel" for various grinding, brushing and cutting work on my bike project, because then it can not do without such a handy and convenient device. For well under 30 that's fine - for the 100 I would have done me very hard. The little man's man lies comfortably in the hand, does not vibrate too much, all controls are reliable and do not cheap impression. The tripod with wave I've tried nn. But its presence was also important to me because I will also work hard to reach areas. Metal to "disconnect" I've tried also with the small cutting discs only rudimentary - but this will probably not go so well with a solid piece of steel. Well - these are 130W for too little. Since it takes rather a handsaw; o) aluminum is likely to go. So far I have used them for shortening and correction loops of plastic fenders. Went great. Property me the Mannesmann M92568 accessory (Amazon.com/gp/product/B000K2T86K/ref=cm_cr_rev_prod_img) equal ordered to have to wear the first brushes / grinding accessory something as an exchange. - I am very pleased! For (together!) To the 40 you get a lot.