ShineMate Dual Action Backing Plate 3":

This high quality velcro backed, urethene backing plate holds all 3-4 inch foam spot pads, making this our most versatile backing plate.

This is the perfect size for spot repairs as it allows you to focus your polisher's energy on a small area. Your machine will achieve more work and you won't affect the surrounding paint. 

Size: 3" (75mm).