Design: Robust shatterproof construction with variable tooth design on a flexible special steel body (bimetal). The reinforced, stiff base is equipped with threads and drive holes (from ⌀ 32 mm) for secure mounting on the shank. The high quality of the HSS teeth, the tooth geometry, and the low manufacturing tolerances ensure excellent cutting performance and long lifespan. Variable tooth design with 4.5 / 5.5 teeth per inch and reinforced teeth (Tough Teeth). Maximum cutting depth for all sizes is 40 mm. Optimized coating reduces heat generation. SPEED SLOT® – Quick removal of the drill core through stepped cutouts. Note: Adapters and hole saws are compatible with all commercially available bimetal hole saws, but not Bosch-SDS. For stone core bits see No. 788000. Carbide circular cutters for steel see No. 118400, 118500, 119000. Usage: On stationary drilling machines, lathes, or electric hand drills with the appropriate speed. For cutting circular holes in thin to thick-walled materials with flat or curved workpiece surfaces. Suitable for all materials such as steel, stainless steel, brass, copper, cast iron, lightweight metals, wood, gypsum, and plastic sheets, etc. Lubricant supply increases service life (metals). Also well-suited for thin body panels.