Step drill GEKO 5901477163760 4–52 mm, adjustable stepped hole cutter

Step drill GEKO 5901477163760 4–52 mm is a stepped hole cutter designed for drilling and enlarging round holes in sheet metal, plastic and other thin materials. The tool integrates multiple diameters in one body, allowing progressive enlargement of holes from 4 mm up to 52 mm without changing bits. It is intended for workshop use, on-site installations and general metalwork where precise, stage-by-stage hole sizing is required.

Advantages

The stepped design provides a wide range of diameters in a single cutter, reducing the need to switch tools and saving time during repetitive drilling operations. Its geometry enables smooth entry and controlled chip evacuation when used at recommended speeds, producing clean hole edges in sheet metal and plastic. Compatibility with standard drill chucks and quick adaptation to hand drills or drill presses make the step drill versatile for both portable and stationary applications.

Suitable for

• Drilling and enlarging holes in sheet metal
• Cutting holes in plastic panels and thin composite materials
• Installation tasks for electrical boxes, conduit and ventilation ducts
• Workshop metalworking and prototype fabrication

Key specifications

• Working diameter range: 4–52 mm in stepped increments
• Tool type: adjustable stepped hole cutter (step drill)
• Intended materials: sheet metal, plastic and other thin materials
• Shank compatibility: designed for standard drill chucks
• Usage mode: suitable for hand-held drills and drill presses

How to use

Secure the step drill in a compatible drill chuck and clamp the workpiece to prevent movement. Mark the hole centre and start drilling at low to medium speed, applying steady axial pressure. Progress through the steps until the desired diameter is reached, withdrawing occasionally to clear chips and avoid overheating. For cleaner edges in thin materials, support the workpiece from beneath and use cutting lubricant suitable for the material when recommended.

Usage recommendations

Use appropriate personal protective equipment, including safety glasses and gloves. Select drilling speeds and feed rates based on material thickness and type; lower speeds are generally better for thin metal to reduce burrs and heat. Regularly clear chips and inspect the cutter for wear; replace the tool if cutting performance deteriorates.