Ikea Billy Bookcase brackets

Wasn't happy with the brackets that came with the book case to connect the book cases together at a 45 degree angle.

I designed these to be added to the back of the book cases. Drill some holes through the shelf (I lined them up so that they would be hidden once the shelves where in place) and secure using M4 bolts/nuts.

Did a great job of securing them at the correct angle.

The straight ones I didn't end up using - i just screwed the two book cases together.