They work quite well and hold the screw securely, they are made by Dewalt for Dewalt's quick witted screwdrivers but can be used with a few other similar designs. The biggest problem is not letting the driver's head stick out far enough. You get a hard bit of material to drive the screw in and it will drive it in far enough that it doesn't start removing the head because it just won't let the head go deep enough. But for most tasks it works fine. I would buy it again, that's for sure.
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