For better durability, it has been equipped with Bosch bi-metal with 8% cobalt alloy. It also has an improved progressive tooth bar that allows for faster cuts. Use this hole saw for drilling holes in wood, drywall, plastics, metals, non-ferrous metals and stainless steel. It is suitable for all cordless and mains drills. Diameter mm: 121, diameter inch: 4 3/4, working length mm: 44.