Drill Bit Smart HSS cylindrical 4 mm, pack of 10 (model 24-040)

Cylindrical HSS drill bits Smart 4 mm in a pack of 10 are intended for general-purpose drilling tasks in workshop and maintenance environments. Made of high-speed steel, each 4 mm bit delivers wear resistance and dimensional stability when working with metals, wood and plastics. The straight (cylindrical) shank allows use with standard chucks and bench drills, providing a simple, reliable solution for producing precise 4 mm holes.

Advantages

The high-speed steel construction enhances cutting life and resistance to heat and abrasion during repeated use. A consistent 4 mm diameter and straight shank geometry make these drill bits compatible with most handheld and stationary chucks. Supplied in a pack of 10, the set reduces downtime by providing spare bits for routine workshop and maintenance work. The overall design balances durability and general-purpose versatility for a wide range of materials.

Suitable for

• Drilling holes in steel, aluminum and non-ferrous metals
• Drilling in soft and hardwoods for joinery or furniture repair
• Drilling through plastics and composite panels
• Routine maintenance, repair tasks and light fabrication

Key specifications

• Material: high-speed steel (HSS)
• Tip diameter: 4 mm
• Shank type: straight (cylindrical) shank suitable for standard chucks
• Pack quantity: 10 pieces
• Intended materials: metals, wood, plastics

How to use

Select an appropriate drilling speed for the material — lower speeds for harder metals, higher speeds for wood and plastics — and secure the workpiece before drilling. Fit a 4 mm cylindrical shank bit into a compatible chuck and tighten firmly. Use cutting lubricant when drilling metals to reduce heat and prolong bit life; for wood and plastics, pecking or gradual feed helps avoid melting or splintering. After use, clean chips from the flutes and store the bits dry to prevent corrosion.

Usage recommendations

For best results when drilling metals, apply light cutting oil and moderate feed pressure; avoid overheating by using intermittent drilling if necessary. Replace worn bits to maintain hole accuracy and reduce the risk of workpiece damage. Match drill speed and feed to the material for consistent 4 mm hole quality.