Let me start by saying that I'm a heavy equipment mechanic. When I'm not doing maintenance, my compartment is filled with gear for repair or crafting. This is my first AirCat product so I was skeptical. This drill replaces my Ingersoll Rand 7803RA which is no longer working. AirCat Chuck The Jacobs chuck is stamped 3/8 x 24mm but will accept a 1/2" drill bit. I used this drill bit to install wear resistant polymer plates on tractor fifth wheels. This drill will allow you to quickly drill through a 7/16" thick plate of fifth wheel steel. Time will tell if this takes longer than the IR drill.