Sandflex bi-metal holesaws work excellently in most materials such as wood, plastics, non-ferrous and ferrous steel, including stainless steel. The bi-metal construction features 8% cobalt for increased wear resistance. They fit all power drills, both stationary and portable. Knockout holes allow for easy removal of cores. The cutting depth is a maximum of 38 mm (1 1/2"). There are 4 to 6 teeth per inch, and the maximum hole size is the nominal holesaw size plus 1.5 mm. All holesaws are packed in a self-service package with an instruction leaflet that also serves as a tooth protector. Designed for professional use, these holesaws have a standard attachment to fit a wide range of arbors. They offer high quality in terms of precision, durability, and versatility. No matter what you are cutting through, we have the holesaws and arbors to tackle the job, time after time. Engineered to improve productivity and craftsmanship, from the design of the cutting edges to the technologies used to produce the holesaws.