This clip is so that you can hang the tool on your belt or even on the pocket of your jeans. This is awesome when you need a place to set the tool or so that you can hang it off your belt and then climb up a ladder instead of setting it down somewhere.
Last year, an 18V drill with battery was dropped off a ladder and stuck me in the back of the calf as I worked on the ground below. It had a new 3/16's bit in it which sunk into the bone in my leg. The chuck of the drill hit my leg so hard that I got a massive blood blister from that - with a 3" deep hole in the center to and into the bone. If there would have been a clip on the drill it would never have been set on the ladder and then dropped. Clip = good. It looked like I'd been shot with a 22.
Check out
Dewalt Power Tools, Greenlee Tools, Ridgid Tools, DeWalt Cordless Tools, Milwaukee Power Tools they have great deals. So does Costco if you want to buy the whole kit.
-Stumbaugh