Quick view Choose Options Plasti-Grip® PMF (Plastic Masonry Fastener), Choice of Sizes Rodenhouse Plasti-Grip® Plastic Masonry Fasteners attach Dow Thermax, Roxul ComfortBoard, Styrofoam Blue Board,... Rodenhouse $109.79 - $144.79 Plasti-Grip PMF (Plastic Masonry Fastener), Choice of Sizes