Screwdriver bit set Bosch Extra-Hart, 3 pcs, 25 mm length, 1/4 inch (6.35 mm) hex shank

Bosch Extra-Hart screwdriver bit set contains three hardened bits, each 25 mm long, with a 1/4" (6.35 mm) hex shank compatible with standard bit holders and many hand drivers and power drills. The set is engineered to provide stable engagement with a range of screws for assembly, repair and maintenance tasks where a short, robust bit is preferred. The Extra-Hart treatment increases wear resistance and retains fit between the bit tip and fastener head during repeated use.

Advantages

The bits are heat-treated for increased hardness and durability while maintaining dimensional accuracy at the tip to reduce cam-out. The 1/4" hex shank ensures quick, secure insertion into bit holders and chucks designed for standard bits. A compact 25 mm length offers better control in confined spaces and reduces the chance of bending compared with longer bits under torque.

Key specifications

How to use

Select the correct bit from the set for the screw head type and insert the 1/4" hex shank into the bit holder or chuck until it seats securely. When using a power driver, set an appropriate torque or clutch setting to avoid overdriving and potential damage to the fastener or workpiece. Apply steady pressure and keep the driver aligned with the screw to maintain optimal engagement between the bit tip and fastener head.

Recommendations

For prolonged bit life, avoid excessive lateral force and remove debris from screw heads before driving. Replace bits that show rounded or deformed tips to maintain safe and efficient operation.