Keyhole Router Bits bore a hole in the back of a picture frame or plaque creating an interior lip to hold the head of a nail or screw.
Large diameter: 1/2" Small diameter: 5/16" Maximum depth: 7/16" Shank: 1/2"
Other Items from Router Bits 1/2" Flush Trim Bit - 1/2" Shank - 1/8" Core Box Router Bit, 1/4" Shank - Amana 1" Core Box Router Bit - 1/4" shank - Amana 1/2" Core Box Router Bit - 1/4" shank - Amana 1/4" Core Box Router Bit - 1/4" shank - Amana 3/4" Core Box Router Bit - 1/4" shank - Amana 3/8" Core Box Router Bit - 1/4" shank - Amana 5/8" Core Box Router Bit - 1/4" shank - 1/2" Cove Router Bit - 1/4" Shank - 1/4" Cove Router Bit - 1/4" Shank - 3/16" Cove Router Bit - 1/4" Shank -