Drill bit set GEKO G38572 stepless bits 3 pcs Ø3–30 mm

GEKO G38572 stepless drill bit set includes three continuously adjustable bits that cover diameters from 3 mm up to 30 mm in one tool. These stepless bits are designed to create variable-diameter holes without the need to change individual bits, saving time when working with different hole sizes. The set is suitable for use in portable hand drills and drill presses and is intended primarily for woodworking, plastics and soft metals where a range of hole diameters is required.

Advantages

The stepless design allows smooth adjustment of hole diameter within the specified range, reducing the number of bits needed for jobs with varying hole sizes. The set’s three sizes provide coverage across small, medium and large diameters while maintaining a compact kit footprint. Compatibility with both handheld drills and drill presses ensures flexibility for workshop or on-site use. The bits are engineered to cut cleanly in wood and plastics and to perform acceptably in softer metals, facilitating precise, single-pass hole cutting.

Suitable for

• Creating variable-diameter holes in wooden boards and panels
• Drilling through plastic sheets and components for cable routing or fixtures
• Working with soft metals such as aluminium where adjustable hole sizes are required
• Rapid prototyping or repair tasks that require different hole sizes without tool changes
• Use in hand drills and bench drill presses for general workshop tasks

Key specifications

• Diameter range per bit: continuously adjustable from 3 mm to 30 mm
• Number of pieces in set: 3 adjustable bits
• Intended materials: wood, plastics, soft metals
• Compatible with: handheld electric drills and drill presses
• Cutting method: single stepped/stepless adjustable cutting head for variable hole sizes

How to use

Install the required stepless bit securely in the drill chuck, ensuring correct alignment and clamping. Adjust the cutting collar or adjustment mechanism to the desired diameter according to the bit’s scale or markings, then tighten any locking screws or collars to prevent slippage. Start drilling at low speed to establish a clean entry point, then increase speed as appropriate for the material. Apply steady, even pressure and withdraw periodically to clear chips when working with wood or plastics. For soft metals, use cutting fluid if recommended for the material and maintain controlled feed to avoid overheating.

Usage recommendations

Use appropriate clamp or fixturing to secure the workpiece and reduce runout. Select proper drill speed for the material: lower speeds for larger diameters and metals, moderate to higher speeds for wood and plastics. Inspect cutting edges before use and replace if worn to maintain clean hole quality. Wear eye protection and follow standard safety practices when operating power drills.