Cutting depth: up to a maximum of 38 mm (1 1/2"); Ø 52 mm - The RUKO bi-metal hole saws can be used in hand and pillar drilling machines. For pillar drilling machines, please use manual feed only. Bi-metal hole saws HSS with variable tooth design. For easily machinable materials, the variable tooth design ensures a more uniform cut and reduced effort. Due to lower vibration and heat generation during cutting, a service life increase of up to three times is achieved. Suitable for unalloyed steel (up to 700 N/mm² strength), non-ferrous and light metals, plastics, gypsum, lightweight construction, fiber, plywood panels, and wood processing.