Hitachi’s latest impact driver, the WH18DBDL2, is almost certainly the most advanced impact driver in the world. It has a whopping 207 Nm of torque and more features than you can poke a stick at.
It boasts a brushless motor, IP56 rating, a triple anvil system and 4-modes including an excellent self-tapping mode. It’s a helluva impact driver and doesn’t come cheap.
Triple Hammer ! http://amzn.to/2upissY