Screwdriver bits are typically made up of a shaft and a tip. A screwdriver bit's shaft is typically hexagonal in shape, with six flat sides. This shaft is fitted into the end of a screwdriver that has a bit holder. The shaft's shape prevents the bit from rotating within the bit holder. The tip end of a screwdriver bit may have many shapes.The bit's head is designed to fit into the head of a screw. As the screwdriver is spun, the bit rotates as well. This is what causes the screw to turn.

TH Torsion Extra Hard bits are a hard wearing great value bit with longer service life. Ideal for driving into timber and general construction materials. Use with Wera Bi-Torsion Rapidaptor for extended service use.