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
Keyhole Hanger
Easy-made mortises for keyhole hangers | Wood
Hillman 5lb Keyhole Hangers in the Picture Hangers department at Lowes.com