Sandflex® bi-metal hole saws work excellently in most materials such as wood, plastics, non-ferrous and ferrous steel, including stainless steel. The bi-metal construction with 8% cobalt increases wear resistance. These hole saws are suitable for all drilling machines, both stationary and portable. Knock-out holes allow easy removal of cores. The maximum cutting depth is 38 mm (1 1/2"). There are 4 to 6 teeth per inch, and the maximum hole size is the nominal hole saw size plus 1.5 mm/- 0.0. All hole saws are packaged in a self-service box with instructions for use, which also serves as a tooth guard. Designed for professional use, these hole saws feature a standard attachment for a wide range of applications. They are high quality in terms of precision, durability, and versatility. No matter what you're cutting through, we have the hole saws and arbors to get the job done time after time. Designed to improve productivity and craftsmanship, these products focus on the design of the cutting edges and the technologies used.