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Bosch 4 mm x 50 mm drill bit is a compact, general-purpose tool designed for drilling precise small holes in metal and wood. With a 4 mm cutting diameter and a 50 mm overall length, this bit suits routine assembly, repair and DIY tasks and fits standard drill chucks. The geometry and material selection aim to deliver consistent hole quality and reliable performance in common workshop and household applications.

Advantages

The drill bit offers accurate small-diameter drilling with a stable cutting edge that helps reduce wobble and produce clean holes. Its dimensions make it versatile for through-holes and shallow-depth applications while remaining simple to mount in most handheld and bench drills. The construction provides wear resistance appropriate for occasional to frequent use in metal and wood, supporting repeatable results across similar tasks.

Suitable for

• Drilling small holes in metal sheets and thin plates
• Creating pilot holes in wood for screws and dowels
• Routine assembly and repair work in workshops and homes
• Hobby and DIY projects requiring precise 4 mm holes

Key specifications

• Cutting diameter: 4 mm
• Overall length: 50 mm
• Compatible materials: metal and wood
• Shank type: standard round shank suitable for common chucks

How to use

Secure the drill bit in the drill chuck and tighten firmly. Select an appropriate drilling speed and apply steady, moderate pressure while keeping the drill perpendicular to the work surface. For metal, consider using cutting oil or lubricant and reduce speed to extend bit life and improve hole quality; for wood, higher speeds are generally acceptable and chips should be cleared regularly. Withdraw the bit occasionally to remove swarf and prevent clogging when drilling deeper holes.

Recommendations

Use appropriate personal protective equipment such as safety glasses and gloves. Match drill speed and lubrication to the material: lower speeds with lubricant for metals, higher speeds for wood. Replace the bit when wear or chipping affects hole accuracy.