This high-performance bi-metal hole saw is designed for versatility and durability, making it ideal for a wide range of drilling applications in wood, plastic, plywood, and thin metal sheets. With a 4-inch diameter, it creates precise holes up to 4 inches wide and a cutting depth of 1-1/4 inches, perfect for most general-purpose drilling tasks. A unique feature of this hole saw is its integrated valve and hole saw design, which prevents the hole opener from falling out during use. This enhances safety and efficiency while also reducing product costs.