Roller Bearing Weld-On Hinge C10012 Cam box trim plates are

Cam box trim plates are brass (satin chrome plated)

A pair is what you normally need for one shutter

A pair is enough for two shutters

one in a slot on the edge of the face frame and the other in a slot on the edge of the door

Roller Bearing Weld-On Hinge C10012 Cam box trim plates areHeavy duty weld on hinges made with dependable roller bearing design. Roller bearings are made using a hardened steel inner raceway and a hardened steel roller cage bearing held in place with a grade 5 zinc plated bolt. Fitted with a grease fitting for applying periodic lubrication. Features a very large weld surface for maximum weight bearing. 1000 Pound Model: Weight Rating: 1000 pounds per pair Height: 3 1 2" Width: 2 3 8" 3000 Pound Model: Weight