If you are installing a dual tank conversion in your Mercedes you are going to need a way to allow the hoses to enter the trunk somewhere. The best way to do this is to use a hole saw to cut one or two round holes in the spare tire will in bring in the coolant hoses and/or fuel hoses. The hoses can be protected from chaffing with tape and then sealed with Silicone to prevent water and dirt from entering your trunk. Yes, I know these hole saws are not meant for metal - and that is why you need this cheap set. No need to dull your expensive hole saws. Once or twice on metal and the saws are done. But then you wont be using all the sizes in this kit so you will end up with extras for future wood projects around the house.
This little kit contains two mandrels and 8 hole saw cups from 3/4 inch to 2 and 1/2 inch.