#4 Black Oxide Matte Finish Coated Brass Plain Grommets, 12 Piece Set This #4 grommet and plain washer set is used to support holes in a range of fabrics. Forged from heavy-gauge brass, these compact yet resilient pieces of hardware can endure any type of climate. The finish gives a matte black look and assists in abrasion resistance. Easily perforate a hole into the fabric then position the metal grommet and washer with the appropriate setting tools. While ideal for drapery, curtains, and vinyl banners, they also operate well in custom upholstery, outdoor awning, and marine jobs. Specific applications consist of awnings, seats, boat covers, flags and banners, luggage, privacy drapes, safety gear, signs and media, outdoor tents, and tarpaulins. The hole's inner diameter is 1/2" We Ship Internationally! Northwest Tarp Canvas Have a Nice Day!