Drill Bit Set GEKO G38506 HSS TiN conical 4 pcs (Ø4–12, Ø4–20, Ø4–32, Ø4–39) for aluminium

GEKO G38506 is a set of four conical HSS TiN-coated drill bits engineered for drilling aluminium and other non-ferrous metals. Each stepped bit provides a range of hole diameters in a single tool — Ø4–12, Ø4–20, Ø4–32 and Ø4–39 — allowing you to create progressively larger holes without changing tools. The combination of high-speed steel (HSS) construction and titanium nitride (TiN) coating increases surface hardness and wear resistance, while the conical (step) geometry supports controlled material removal and faster hole enlargement in thin and medium-thickness workpieces.

Advantages

The TiN coating reduces friction and extends cutting edge life compared with uncoated HSS, and the HSS core maintains toughness to resist chipping during drilling. Using conical step bits from this set simplifies operations where multiple hole sizes are required, reduces tool changes and improves workflow efficiency. The stepped design also helps deburring and creates consistent hole diameters while reducing the risk of snagging on softer materials like aluminium.

Suitable for

• Drilling aluminium sheets, plates and profiles
• Creating or enlarging holes in non-ferrous metals (brass, copper)
• Metalworking, fabrication and light repair tasks
• Situations where multiple hole sizes are needed without frequent bit changes

Key specifications

• Material: High-speed steel (HSS) with titanium nitride (TiN) coating
• Type: Conical (stepped) drill bits
• Set composition: 4 stepped bits covering diameters Ø4–12, Ø4–20, Ø4–32, Ø4–39
• Intended materials: Aluminium and other non-ferrous metals
• Typical applications: Progressive hole sizing and hole enlargement

How to use

Select the stepped bit that includes the target diameter and clamp the workpiece securely. Fit the bit in a drill or drill press chuck, ensure concentric mounting and set an appropriate rotational speed for aluminium—moderate to high RPMs depending on bit diameter and machine capacity. Use light feed pressure and steady cooling or lubrication if required to reduce heat buildup; withdraw the bit occasionally to clear chips. Start with the smaller steps and progress to larger diameters as needed for a clean stepped hole.

Usage recommendations

For best results when drilling aluminium, use a suitable cutting fluid or light lubricant, maintain steady speed and feed, and avoid excessive pressure that can cause burring or bit overheating. Regularly inspect the TiN coating and cutting edges for wear and replace bits when performance declines.