ISC Rigging Plates are made from high strength Aluminium and have 20mm (over 3/4") holes, to allow Karabiners to be fully rotated.  

Rigging plates can provide numerous advantages in rope access, such as allowing multiple anchors to be quickly and securely connected; reducing the risk of friction on the rope; and creating a singular, easily accessible point for connecting the rope. Additionally, they make it simpler to connect and lock rescue carabiners, and to allow for the proper functioning of a belay device.