Drill bit GEKO 7124884, 4–12 mm range, HSS twist drill for metal and wood

GEKO 7124884 is an adjustable HSS twist drill solution covering diameters from 4 to 12 mm. The design provides a compact option for tasks that require several hole sizes without changing individual bits. Intended for drilling in metal and wood, this drill fits standard drill chucks and is suitable for general workshop work, maintenance and light construction where a variable diameter range is useful.

Advantages

The HSS construction delivers hardness and heat resistance needed for repeated drilling in metals and wood. A single adjustable range of 4–12 mm replaces multiple individual bits, reducing tool changes and simplifying storage. Compatibility with standard chucks ensures quick mounting and use on common portable and bench drills. The twist-drill geometry supports straightforward chip evacuation and consistent hole quality when used with appropriate speed and feed.

Suitable for

• Workshop drilling and maintenance tasks
• Light construction and installations
• Drilling metal sheets, structural metal parts and wooden components
• Situations requiring a range of hole diameters without swapping bits

Key specifications

• Diameter range: 4–12 mm (adjustable)
• Type: HSS twist drill
• Suitable materials: metal and wood
• Compatibility: standard drill chucks

How to use

Secure the adjustable drill in the chuck of a handheld or bench drill, ensuring proper clamping and concentricity. Select an appropriate drill speed for the material: lower speeds for harder metals and higher speeds for wood. Apply steady feed pressure and allow the drill to cut without excessive force; withdraw periodically to clear chips when drilling deeper holes. Use cutting fluid or lubricant when drilling ferrous metals to reduce heat and prolong tool life.

Usage recommendations

For best results, match drill speed and feed to the workpiece material, use appropriate cutting fluid on metals, and inspect the cutting edges for wear before extended use. Replace the tool if excessive runout or wear affects hole accuracy.