Over time, drill bit sets become dull with use. An electric drill bit sharpener will restore the sharpness of your entire collection and can restore your drilling to it's original efficiency, and some bit sharpeners have additional features you may find well worth the additional expense. One such feature allows you to restore or create "split points". A split point allows the bit to be "self-centering", reducing the tendency for the bit to wander during drilling. That can go a long way toward eliminating some of the frustration encountered with a tricky drilling situation from ladders, odd angles, or overhead work.