DEWALT DW056 18V Cordless Impact Driver; Powerful, Versatile, and Light Weight (January 2005) The impact driver is now perhaps the most used tool in my kit! Anything that has to be driven or screwed is done with this tool. Self tappers, lag bolts, anchors, tap-cons, you name it! The finesse this tool has allows me to run in smaller stainless steel fasteners without twisting them off. The battery seems to last forever which is an added bonus. Likewise the quick-change chuck makes it easy to swap out bits in a hurry without miss a beat.