ugh i want to give this five stars its a great drill. but the real 5 star drill is a smaller version of this model. one that has the function of a hammer drill. this light and genuine MVP. I love Makita products. durable and lightweight. I broke the plastic lining on the smaller one. and I know the metal chuck loosens on some other brand drills. (Due to inertia when the heavier metal body of the cartridge comes to a complete stop.) This larger model doesn't seem to have this problem. Unfortunately, it does NOT have a hammer drill function. but I missed it when comparing drill models, this is a great drill and probably a lot more powerful than advertised. but UGHH is a bit heavy. back to the lightweight model! giggle