Self-piercing grommets with plain washers in #1 size and 5/16 inch diameter offer a heavy-duty solution for reinforcing fabric and materials without the need for pre-punched holes. Made from marine-grade stainless steel, these rustproof and corrosion-resistant grommets cut and set in one action using compatible bench presses or setting tools, ensuring consistent quality and smooth edges that reduce wear over time. Each 500-pack set includes durable metal washers designed for outdoor, industrial, and marine applications, making them ideal for projects like patio upgrades, outdoor decor, sign making, and fabric reinforcement. Their self-piercing design streamlines installation, supporting heavy-duty use with a reliable and professional finish.