Wera TZ Torx Torsion Zone Bits.-Ductile, tough bits with torsion zone. -Wera's Torsion technology absorbs the damaging peak torque loads that cause premature wear. -Made from high grade steel and precision manufactured.-These bits are specifically designed for use in difficult screwdriving applications, such as in sheet metal or steel. -Combined with the BiTorsion Rapidaptor bit holder, performance is further improved. -Torsion technology and unique precision hardening process increases service life of the bit. -Extremely hard wearing, premium quality Extra tough and ideal for screwdriving into metal.-Drive: 1/4" Hex.