The Seafit 5/8" (16mm) Bailer Plugs are made of brass and neoprene, ensuring durability and long-lasting use. The Cam-Action Lever 2 Pack design makes it easy to use and install. These plugs are perfect for your plumbing and ventilation needs, and are a great addition to any boat. Please note that this product contains lead, a chemical known to the state of California to cause birth defects and/or reproductive harm. Be sure to use and install these plugs with care, and consult your local laws and regulations for proper use.