UPDATE! I recently had a small garden furniture assembly project. It is a lightweight material with little effort. I had to put the corner in a couple of tight spots and after about 13 screws something inside popped out and the corner bit is unusable. I didn't expect it to go in the bin so quickly. I leave 3 stars because the attachments are worth it. DO NOT do shock work with them, but they're good for everyday little things. The corner piece is just not of good quality. This is a very handy tool kit to have on hand. When you're in trouble and need a little wiggle room or a tight space, I've found that the right tool makes the job that much easier. I have another Dewalt rectangular adapter but it is much larger than this one and not practical in some situations. This little guy is smaller and can get to places. I would say the tool kit is on the corner mount and small swivel adapters. An extension cord might be a big deal. Based on the look and feel, you probably won't get much torque out of it. I've used one like this in the past and it always came out for me and it was regular screws. This material is also quite cheap. It doesn't appear to be quality and I can't say it will last long in impact conditions. Not suitable for impact tools unless you may be using a small cordless impact drill. You won't get very far with a real impact wrench. They can get you out of cucumbers, but they might not last long either. That said, I have a cheap plug-in drill and somehow it has survived many, many years of home and garage use so your mileage will vary. All in all, this is a good little kit for any DIY enthusiast.