Yale Hinge Bolts
https://cdn.prod.website-files.com/69fd47b6fd25e9b4c1f02fce/6a7927f2c4ed60382a3c63af_MC10_resize.jpeg
The Yale MC10 is a additional security device for the hinge side of swinging doors. When closed the MC10 is completely concealed and provides added strength against forced entry.