I've had these for about 2 years now and they just rattle with the rest of my quarter inch hex bits (including drills, hole saws and screws) in the box. driver bits) as they come without a storage box (they only stick to the paper card). This is normal though, and they still twist a lot and punch holes in whatever I push them through. I mostly drill through bare wood or wooden studs behind drywall, but I've also drilled through thin sheet metal (fluorescent tube housing) and had no problems with it. I use them with the Makita TDO90DWZ, which isn't supposed to be a workout. This is an impact wrench (also known as an OOMF electric wrench) but since it accepts quarter inch hex shanks I thought it would be a good idea to drill some holes. Did I understand correctly? It spins through the drywall like an electric drill, and then when it hits the wood, the demolition hammers come into play. It rumbles like hell, but the drill spins and a hole is drilled. I mentioned the [abuse] of the tool because I would understand if the drill was designed to spin smoothly but couldn't handle the sharp hits of an impact wrench. But I'm pleasantly surprised to report that these bits give a rat's ass as they turn.