The MILWAUKEE® 3-1/4" HOLE DOZER™ Bi-Metal Hole Saws new 3.5TPI tooth design offers users the longest life in metal applications. These HOLE DOZER™ Bi-Metal Hole Saws feature the industry's only Lifetime Tooth Break Warranty and can take on all general purpose applications, making them the most durable hole saws. Our A Milwaukee 49-56-0183 - 3-1/4" HOLE DOZER™ Bi-Metal Hole Saw