... standard Type:T27(Flat) ,T29(Convex) fiberglass net backing disc, for making flap disc, to match ISO standard Types and dimensions(According to ... ,140mm,170mm, 178mmApplications: Used as the backing pads of Flap Disc,Mop Disc and Flap Wheel.Shipment: by 20 feet ocean container.key words ... ,fiberglass backing plate,backing pad,polishing pad backing Fiberglass Backing Disc