Design: Robust shatterproof construction with variable tooth pitch on a flexible special steel body (bimetal). The reinforced, rigid base is equipped with threads and drive holes (from ⌀ 32 mm) for secure attachment to the shank. The high quality of the HSS teeth, the tooth geometry, and the low manufacturing tolerances ensure optimal cutting performance and long service life. Variable tooth pitch of 4.5 / 5.5 teeth per inch with 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 standard bimetal hole saws, but not Bosch-SDS. For stone, see item no. 788000. Carbide circular cutters for steel see item no. 118400, 118500, 119000. Usage: On stationary drilling machines, lathes, or electric hand drills with 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, light metal, wood, gypsum, and plastic sheets, etc. Lubrication increases tool life (metals). Also well-suited for thin body panels.