Matthews 12" Baby Plate 429065 is originally designed for mounting Baby fixtures to the top of set walls, they are also used as the world's lowest stand, nailing to a floor or on an Apple Box. Other names include Baby Nail-On, 750 Pigeon, or just Nail-On Plate. Matthews manufactures Baby Plates in 3", 6" and 12" straight and a 12" Right Angle.
Matthews knurled baby pin ensures whatever is being mounted stays put.