Drill bit set GEKO G38570 — 1/4" hex tapered bits, 3 pcs (3–12.4 mm, 4–12.4 mm, 4–20 mm)

GEKO G38570 is a set of three tapered drill bits with a 1/4" hex shank designed for quick-change chucks and impact drivers. The kit contains tapered bits covering ranges 3–12.4 mm, 4–12.4 mm and 4–20 mm, allowing drilling and step-enlarging of holes in compatible materials. The hexagonal shank ensures secure seating in 1/4" quick-change holders and impact-rated drivers, while the tapered profile enables incremental hole sizing without changing bits repeatedly.

Advantages

The GEKO G38570 set offers a compact selection of taper bits that reduce the need for multiple fixed-diameter bits. The 1/4" hex shank provides reliable grip in quick-change chucks and impact drivers. Tapered geometry permits smooth entry and progressive enlargement of holes, which is useful when widening pilot holes or creating clearance openings. The three sizes included cover a wide span of applications from small through medium holes, which makes the set practical for workshop tasks and on-site jobs.

Suitable for

• Drilling and enlarging holes in soft metals and plastics where a tapered step bit is appropriate
• Workshop and maintenance tasks requiring quick bit changes with 1/4" hex quick-change chucks
• DIY projects and construction jobs using impact drivers or compact drills

Key specifications

• Shank type: 1/4" hex shank compatible with quick-change chucks and impact drivers
• Bit types: tapered (step) drill bits for progressive hole enlargement
• Included sizes: 3–12.4 mm, 4–12.4 mm, 4–20 mm
• Quantity: 3 pieces

How to use

Insert the 1/4" hex shank into a compatible quick-change chuck or impact driver until it locks. Start drilling at low to medium speed to establish a centered entry point, then increase speed as the bit progresses through the material. Apply steady pressure and allow the tapered profile to cut progressively larger diameters; withdraw occasionally to clear chips and avoid overheating. Choose the bit whose range includes the target hole diameter and proceed with controlled, consistent feed to achieve a clean step enlargement.

Usage recommendations

Use appropriate cutting fluid or lubricant when drilling metals to extend bit life and improve finish. Avoid excessive axial force and high speeds on hard materials; for hard steels and brittle materials, select a suitable solid carbide or coated bit instead. Always wear eye protection and follow manufacturer safety guidance for the driver or drill used.