To get the ledge I had to screw extensions onto my already hung new kitchen cabinets. There was no way to fit a screwdriver between the top of the cabinet and the ceiling, but this 90° drill bit got the job done. I'm not sure how well it will hold up over time, but my kitchen project just got a whole lot easier. Please note that regular hex bits are shorter and do not have a groove to interact with the device. However, they still work, but I needed a small pair of pliers to get the bit out of the chuck.