The Forstner Bit delivers excellent lifetime for drilling accurate-fit holes. Its toothed-edge design creates less friction and heat for increased durability. The precision drill bit's short centring tip has two main and one periphery (toothed-edge) cutting edges for spot-on results. Equipped with large chip-free zones, which allow for optimised chip removal, the bit's fast drilling accuracy is further supported. It enables the smooth splinter-free drilling of blind holes as well as edge and slant drilling, e. g. fixing hinges, dowelling and the removal of knotholes. Use when drilling in soft and hard wood, veneered wood and non-laminated chipboard. The Forstner Bit's 3-sided shank prevents spinning in the chuck. It is manufactured to DIN 7483G, cutter hardness is 50 HRC minimum. It is intended for use with all drills (drill drivers, drill stands) with a 10-mm chuck. Forstner Bit has an excellent lifespan for drilling accurate-fit holes. The tooth-edge design creates less friction and heat for increased durability. A short centring tip with two main and one periphery (toothed-edge) cutting edges enable smooth splinter-free drilling. Large chip-free zones for optimised chip removal and fast drilling accuracy. Ideal for softwood and hardwood. Diameter mm: 40.00 Total length mm: 90 Shank diameter mm: 10 Bosch Forstner Bit 40mm. Key Features: For clean, accurate and flat bottomed holes. Unaffected by grain or knots. Range of metric sizes. Sizes 10-32mm have 8mm shank. Sizes 35-50mm have 10mm shank. An excellent quality Forstner bit from Bosch range at a competitive price. Forstner or pattern maker's bits are unlike any other type of boring bit in that they are guided by their rims and centre point. Holes bored with a Forstner are clean, accurate and flat bottomed. Only a Forstner will bore half a hole on the edge of a board or overlapping holes. Being flat bottomed, they are often used for inlays in veneer work. Sizes 10 - 32mm have 8mm shanks, 35 - 50mm have 10mm shanks. N.B These Forstner bits are designed for use in side grain, for end grain boring Sawtooth cutters are recommended.