Uxcell Hardware 1" Dia Metal Keyhole Hanger Brackets, 20 Pack - Walmart.com
key hole hanger
Metal Keyhole Hanger Fasteners For Picture Frames 50pcs Hot Sale - Picture Hangers - AliExpress
Hillman Keyhole Hanger in the Picture Hangers department at Lowes.com
Keyhole Slot Plug - Lee Valley Tools
Geesatis 50 pcs Keyhole Hangers Heavy Duty Single Hole Hanging Plates Metal Picture Hanger, with Mounting Screws, 43 x 16 mm, Silver, Flat Surface - - Amazon.com