Drill bit set GEKO G38121 spiral bits 6, 8, 10, 12, 16, 18 mm

GEKO G38121 spiral drill bit set contains six common metric diameters: 6, 8, 10, 12, 16 and 18 mm. These twist bits are manufactured for general-purpose drilling and are compatible with standard hand drills and drill presses. Designed to perform in wood and plastics and to cut through some metals when correct speed and feed are used, the set covers a range of hole sizes for fitting, assembly and repair work.

Advantages

The set provides a practical selection of diameters in a single kit, reducing the need to purchase individual bits. Spiral geometry ensures continuous chip evacuation and stable cutting action. The bits are suitable for use in both portable and bench-mounted drilling equipment, offering straightforward compatibility with common drill chucks. Their metric sizing makes them convenient for tasks that require standard imperial-to-metric conversions to be avoided.

Suitable for

• Drilling holes in wood for furniture, fittings and joinery
• Drilling through plastics for enclosures, panels and mounting holes
• Light to medium drilling in soft metals when using appropriate speeds and lubrication
• Workshop tasks that require a range of hole diameters for assembly and repair

Key specifications

• Diameter range: 6 mm, 8 mm, 10 mm, 12 mm, 16 mm, 18 mm
• Drill type: spiral / twist bit
• Compatibility: standard drill chucks for hand drills and drill presses
• Typical materials: wood, plastics, some soft metals (dependent on speed and technique)

How to use

Secure the selected bit in the drill chuck and tighten firmly. Select an appropriate drilling speed: higher speeds for smaller diameters and softer materials, lower speeds for larger diameters and harder materials. Mark the drilling position and, if needed, create a small pilot indentation to prevent bit wander. Apply steady pressure and allow the bit to cut without excessive force; withdraw periodically to clear chips when drilling deep holes. Use cutting fluid or lubricant when drilling metals to reduce heat and prolong bit life.

Usage recommendations

Use appropriate personal protective equipment such as safety glasses and hearing protection. Match drill speed and feed to material and bit diameter, and keep the bit sharp and clean for consistent results.