The Mastercraft Bi-Metal Hole Saw Set with 17 Pieces comes in a durable metal storage case that makes it extremely convenient to transport between jobsites. This adaptable saw set includes 11 different bi-metal hole saws, 2 different hex shank mandrels, and 4 replacement ¼” pilot drill bits. Any hole saw larger than 1 ⅛” is designed with an innovative tiered ejection slot that allows for easy clearing of material slugs, so you can drill multiple holes that much faster. The saw blades also feature variable-pitch teeth, which allow them to make smoother, faster cuts through most materials. The bi-metal construction of this Mastercraft saw set allows it to last longer than carbon steel, especially when drilling into wood. The hole saws and other accessories in this kit can be used to quickly cut through wood, metal, and even plastic.