HFS(R) Drill Guide with Chuck Adjustable Angle Drill Holder Guide Stand Positioning Bracket for Electric Drill

Self-assembly, but no instructions provided. That said, it's pretty simple although my first impression was that there must be parts missing (there weren't). The chuck mounting in mine kept working loose, so be prepared with some thread-lock. I needed it for a very basic job, which it did OK, but it's sloppy I'd advise looking elsewhere if you want repeatable accuracy and ease of use.

Does the job but poorly made, this product won't last long if used a lot. The chuck has a lot of play in the bearings and it doesn't slide up and down smoothly. The clamps that you use to adjust the angle of the drill are soft plastic and so the teeth will wear very quickly as you need to make sure the bolts are tight after you have adjusted the angle. But as I bought this for an outside project where I couldn't use my workshop equipment and it did the job, shame it wasn't built sturdier.

I needed to make six absolutely vertical holes in a guitar body to take a string through bridge. I screwed this together, added my drill and a bit and it worked faultlessly. Highly recommended.

Easy to use

Made of metal not plastic. The crosshead wobbles so much on the pillars that there is no accuracy at all. Sent it back.

absolutely rubbish. avoid this at all costs.