"Appears solidly built. Haven't given it any punishment yet. I've put it on a Bosch 750w hammer drill where the original chuck had jammed after a lot of drilling for 7mm holes in hard brickwork:) So it is not a perfect fit, not sure the Bosch one would have been any better as it didn't look the same as the original. Anyway the gap between chuck and body)doesn't bother me. I've rated this as 3/2 stars as I haven't really had the chance to test it. I expect my kit to last years as I have no desire to waste money or prop up cheap manufacturing nations."