The canvas pad is designed for use in the field of polishing and has a thick foam rubber pad that conforms to the shape of your stone and canvas pad. It can be used with diamond compounds or other types of polishes. There are two options for the canvas polishing pads with Velcro Backing - with or without a Screwback Aluminum backing plate that has a 1-1/4"-20 bolt for GENIE and other machines that are designed for this type of attachment.