Set of 8 twist drill bits with 1/4 inch hexagonal shank, suitable for drilling holes in wood, concrete, woodworking and diameters from 10 to 25 mm.

High quality: Made from high-carbon steel, this drill bit offers high hardness, durability, and exceptional reliability. Its crack-resistant design ensures a long service life. Drilling diameters: 10 mm, 12 mm, 14 mm, 16 mm, 18 mm, 20 mm, 22 mm, and 25 mm, suitable for most applications. Its four-flute design facilitates chip evacuation, its fully threaded drive head ensures smooth feed of the drill bit, and its grooved hexagonal shank prevents slippage on the chuck or drill shank. This four-flute drill bit is ideal for deep drilling in wood, nearly doubling the speed, chip evacuation capacity, and drilling depth compared to standard drill bits, for increased productivity. Compatible with 6.35 mm (1/4") hex shank electric screwdrivers and suitable for deep drilling in wood. Perfect for DIY, construction, woodworking, and engineering. An essential accessory for woodworking and impact drivers.