Originally design to make decorative keyhole slots in boxes, these Whiteside Keyhole Bits 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. This bit features 1/4” SH, 3/8” LD and 7/16” CL.