Bosch HSS-G 4 mm Metal Twist Drill Bit Set (2-Piece)

The Bosch HSS-G 4 mm Metal Twist Drill Bit Set (2-Piece) includes two ground high-speed steel twist drill bits designed for drilling holes in metal. The high-speed steel composition is chosen to keep cutting performance stable during continuous use. The bits are rated for metalworking tasks that need accurate, repeatable through-holes. Using the correct bit type helps deliver consistent results in general workshop work and DIY metal jobs. The twin-pack format means a replacement is on hand, supporting an uninterrupted workflow on larger projects.

The bits use a spiral cutting geometry that clears chips from the bore as drilling progresses. This design lets the tool remove material steadily without clogging the hole. The bits fit straight into standard rotary power tools, with no need for specialist collets or adapters. Securing the bit properly gives the frictional grip needed to stop it from slipping under load. Swapping between the two identical pieces lets the operator keep working if one cutting edge eventually dulls.

• 135° point angle helps with initial centring and reduces bit wandering at the start of drilling.
• 4 mm cylindrical shank fits securely in standard keyless and keyed drill chucks without adapters.
• 4 mm cutting diameter produces accurately sized bores for matching fasteners or rivets.
• 43 mm working length sets the maximum material thickness the bits can drill through.
• 75 mm overall length gives adequate clearance between the drill chuck and the workpiece.