The Kupo KG301012 Baby Plate with EZ Grip FInger adapter makes it super easy to mount your light fixtures onto flat objects such as walls and consists of a 5/8" (16mm) stud connected by a large ball joint. It pivots from -45° to 90°, while the collar rotates 360°. The plate size is 3.5" x 6" (9mm x 15mm).