Originally design to make decorative keyhole slots in boxes, these bit are more commonly use to add hanging slots to the back of projects. Just make sure the screws you are using to secure your project fit the bit design. The screw head should be smaller than the large diameter stated below, and screw shanks should be smaller than the small diameter.
We had a little hiccup with a previous order but they reviewed my photos and information and made it right.
I will not hesitate to keep ordering from them in the future
This is if memory serves my 4th shipment from KJP & the 2nd containing Bolivian Rosewood. The product is well packaged, the choice of boards & the milling are top notch. Shop here with confidence.