1-1/2" 38MM Bi-Metal Hole Saw. Made in the USA with global materials, the Bi-Metal Hole Saws last up to 50% longer* and feature patented tooth forms that help deliver fast cuts and long life when drilling through wood, metal, and plastic. Their large, continuous slot provides leverage for easy plug ejection and removal. The durable, bi-metal construction provides the versatility to drill a range of materials and a deeper saw design allows for cutting 2-by dimensional lumber in one pass.