craftsman nextec. we have 5 drills & 1 1/4 impact. All have lith ion batt & have enough tork to run 2 inch wood screws in a 2x4 with ease. nothing against the drills above but when processing thousands of towers & equipment all things must be considered. you must have a drill that is lightweight,compact,very fast but with a speed adjustment & most of all a batt that will last all day. i have helped several scrap yards & goodwill hubs with there deman setup & all are using these drills. some of those guys were using air & every type of high end drill that you can think of. best thing about the drill is the price, have bought them for as little as $39.95 complete new in the box. Craftsman 17586 NEXTEC Drill/Driver: Power Up With Deals at Sears