Drill bit set GEKO 5-piece with countersink, sizes 25–100 mm

GEKO 5-piece drill bit set with countersink includes five drill bits covering diameters from 25 mm to 100 mm. The set is intended for drilling and countersinking operations across a range of materials commonly encountered in metalworking, woodworking and general construction. The compact assortment is suitable for workshop storage or transport to job sites and provides a clear incremental range of hole sizes for tasks that require accurate circular holes and matching countersinks.

Advantages

The set offers a selection of large-diameter bits that reduce the need to purchase individual sizes. Each bit is designed to work together with the included countersink, allowing a single operation to produce a clean hole and a beveled edge for fastener seating. The compact arrangement simplifies storage and selection on site, and the covering range from 25 mm to 100 mm accommodates common large-hole requirements without frequent tool changes.

Suitable for

• Creating large-diameter holes in wood for plumbing and electrical installations
• Drilling through soft and thin metals for installation of pipes and ducting
• Preparing holes and countersinks for bolted connections in construction components
• Workshop tasks requiring a range of matched hole sizes for dowels, sleeves or inserts

Key specifications

• Set composition: five drill bits with matching countersink
• Bit diameters: 25 mm, 40 mm, 55 mm, 75 mm, 100 mm
• Intended use: drilling and countersinking operations
• Suitable materials: wood, thin metal, plastics and composite panels (subject to cutting parameters)
• Storage: compact set designed for workshop or on-site transport

How to use

Select the drill bit size appropriate to the required hole diameter and secure it in a drill or drill press with sufficient chuck capacity. Mark the center point and, if necessary, pilot-drill a smaller guide hole to improve accuracy. Use the countersink to create a beveled edge after drilling or combine drilling and countersinking in a single step where the tool and workpiece allow. Operate the drill at a speed suitable for the workpiece material and apply steady feed pressure; reduce speed and increase feed for large-diameter holes in dense materials. Use appropriate clamps, personal protective equipment and debris extraction when working.

Usage recommendations

For best results, start with lower rotational speed and increase feed gradually when cutting large diameters; check cutting edges regularly and replace bits when wear affects hole quality. When working with metal or composite materials, use cutting lubricant and appropriate safety measures.