The milwaukee m18 fid fuel impact driver offers 4 unique modes of operation with each suited to a particular function they are mode 1 for precision work mode 2 helps prevent damage to fasteners and material mode 3 delivers maximum performance for the toughest applications mode 4 intelligently detects when the tool has impacted on a fastener for one second automatically shutting the tool down reducing overdriving and damaging materials mode 4 offers precision performance via a controlled st