Theres a couple different options from milwaukee. In the case of these two. The 2662 is a brushed motor single speed unit. Which will be the "cheaper" unit. The 2767 has a brushless motor and 3 speeds. The 2767 has 3 settings which change the amount of impacts per minute. And the 2767 is a bit shorter.
The fuel brushless motors should also last longer than brushed.
I would say if you have milwaukee batteries/tools buy the 2767 bare tool.
Also if you think youll be doing frequent socket changes get the unit with the friction ring not the pin detent. The 2767 has both options available. Im not sure about the 2662.
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