Last year we got new Milwaukee Fuel 18V brushless drills for our ice augers. I had a NimRod that lasted about 8 years and was pretty happy with it (it did bend once but I was able to straighten it). I had been using it with a 36v Bosch that was probably about 800 in/lbs of torque. In deep ice with the new Milwaukee Fuel drill it twisted and bent the 3/8 shaft that goes into the chuck. I was in a pinch and needed another adapter and nobody around here had anything but the HT adapter at F & F and that lasted about 30 seconds. Total joke. Anyway, really couldn't find exactly what we wanted, so we had a machinist make 100 of these and got them coated.
We had 4 criteria that it needed to:
1. be for 1/2 chuck and strong enough to the best drills on the market today and for the drills of the future.
2. have an adjustable length and long enough for deep ice/snow so you don't have to bend over and break your wrist or fall when the auger catches at the bottom of the hole.
3. have a hole near the top so a short bolt could be used as a stop for a 9" piece of 1"x2" wood used as a safety stop if the auger falls from the chuck.
4. be rust and corrosion resistant.