The best self-eating bat I've ever used. I use it to drill 2x16 joists and it's amazingly fast. As other reviewers have said, don't use this with a drill that doesn't have a clutch. I use it with Dewalt's "hole-hawg" version called the DW124K. This monster has enough mass and grip that I can hold onto while drilling. The only time I got hurt was when I was drilling through a small piece of 2x4 that slipped and hit my leg (to prevent this, first screw the smaller boards onto the larger pieces that will hold the small piece while drilling ). Never had any issues with lag, which is what it's made for. I'm pretty sure I've even drilled through screws and nails and mine still works.