I have the Dewalt RotoZip tool. I can not reccomend it to anyone else. The chuck is tightened by holding two plastic buttons, a very poor design. The bit will slip in the chuck, stop turning, turn blue from the friction and break off. Of course, you can't see that it is happening because the bit is in the wall. It cost me an extra trip to Big Orange to buy a second package of bits to figure out what was happening. I now carry a wrench with the tool to make sure the chuck is tight.