Keyhole bits keep breaking in production -

BNF 8mm Shank Keyhole T-Slot Woodworking Cutter Router Bit 12 keyhole slot bit How to guide for using a keyhole router bit for cutting keyhole slots in plaques, picture frames and other wall hanging items keyhole slot hanger Originally designed to make decorative Keyhole slots in boxes, these bits are more commonly used now to add hanging slots to the back of projects

keyhole slot bit MLCS Key Hole Router Bits create a keyhole slot that allows a picture or other object to be hung securely on a wall using a screw or nail