The NR2 Nut Runner adapter is designed to be used in a standard 7/16inch hex impact wrench chuck and fits into either end of the socket. The NR2 Nut Runner is hollow, permitting up to 6 inches of bolt length to extend beyond the nut. Lastly, at 11 inches long and 2 3/8 inch in diameter, its slim design makes it easy to store on the bucket and also makes it comfortable for transmission linemen to use