Used in conjunction with the pin receptacle fitting for Delta casters (sold separately) or with plate-mounted casters, this corner protector can be placed between the plate and the mounting surface to shield furniture corners from damage. Made of durable nylon, it measures 83mm × 83mm (3 1/4" × 3 1/4") and is compatible with caster plates from 50mm (2") to 70mm (2 3/4") square.