They were a replacement for a Kreg kit I bought which had a screwdriver that wore out after about 40 screws and made it impossible to get in the bag to drive hole bolts and essentially triggers a cam. I was hoping these would be better but unfortunately the long one only held about 10 screws and then started slipping out. Absolute bullshit, and that's where it ended. Buy the Milwaukee version of this. I have one of these and completed a project with it, but would like a longer one instead of using an extension. A Milwaukee bit doesn't wear out, although it does exactly the same job. This way you can make things durable. This Kreg driver set is a waste of money.