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Plastic composite 1/2" crown 19/20 gauge staples are manufactured with a blend of polymer resin and fiberglass - 100% steel and metal-free. These 19/20 gauge composite staples work exclusively with the Spotnails MT19/12. Spotnails plastic composite staples will not degrade in sunlight or high heat conditions. These plastic staples are ideal for boat building, casket manufacturing, timber processing, and more.