Bimetallic hole saws, high-speed steel with variable teeth. With easy-to-cut materials, the variable teeth give a smooth cut will minimal effort. Due to the lower vibration and heat generation during cutting, a service life is achieved by up to three times. Suitable for mild steel (up to 700 newtons/millimetre in ² strength), non-ferrous and light metals, plastics, gypsum, lightweight, fibre, plywood and wood processing. Technical specifications: Diameter: 210.0 mm. Cutting depth: up to 38.0 mm Cutting: High-speed steel Tooth type: variable gearing Body: Special steel Right-hand cutting Properties: High concentricity Stable construction Hole saws and shaft in two parts, hence fast assembly and change of different hole saw diameters. Positive rake angle and interface provide an aggressive cut The teeth are welded to a body made of special steel Good chip removal Lateral slots in the body help to remove the cut parts. Replaceable centre drill Instructions for use: Not suitable for percussion drilling. Drill with lightweight and uniform contact pressure. Avoid oscillations Observe speed table Use coolant