• Product Code: Pro-Step
  • Availability: In Stock
$0.00 Ex Tax: $0.00

Perfect for consistently accurate holes in trunking and sheet steel

  • Up to 13 drill diameter steps for convenience and multiple hole diameter options
  • Laser etched diameter markings allow repeat production of error free, reliably accurate holes
  • Fully ground body profile for perfectly round burr free holes
  • Precision ground, tapered cutting edges allow material up to 6mm to be drilled
  • Made in Sheffield

Pro-Step can be used in:

  • Sheet steel
  • Non-ferrous metals
  • Plastics
  • Formica
  • Plywood

Pro-Step is ideal for:

  • Holes of up to 35mm in metal enclosures, trunking, cabinets, cladding, switch-gear etc
  • Easily opening up existing holes
  • Jobs which require  specific tools with diameters suitable  for ISO threads and clearance holes
  • Applications where many different diameters are reqiured which are available on one tool 


Please see Technical tab for minimum chuck requirement and recommended speed chart. 

Size mm

Typical Applications
Step Increments

Start Diameter

Max Material

Part Number  


4 - 22


4, 6, 8, 10,
12, 14, 16,
18, 20, 22

4mm 5mm EMWSD04-22  
5 - 35

5, 7.5, 10, 13,
16, 19, 21, 23,
26, 29, 31,
33, 35

5mm 3.5mm EMWSD05-35  
16 - 25


Approx 6mm 3.5mm ESD16-25  
16 - 32


Approx 11m 3.5mm ESD16-32  
12 - 25 ISO
Core size
for M12x1.5
conduit thread (tapping)

for 12mm conduit

Core size
for M16x1.5 conduit
thread (tapping)

Clearance for
16mm conduit

Core size
for M20x1.5 conduit
thread (tapping)

Clearance size
for 20mm conduit

Core size
for M25x1.5 conduit
thread (tapping)

Clearance size
for M25 conduit

6.5mm Approx



Recommended Speed RPM

Diameter Size mm Min. Chuck Requirement Mild Steel RPM Stainless RPM Non-ferrous Part Number
4 - 22 10mm 400 150 400-1000 EMWSD04-22
5 - 35 13mm 300 100 300-700 EMWSD05-35
16 - 25 10mm 400 150 400-1000 ESD16-25
16 - 32 13mm 300 130 300-800 ESD16-32
12 - 25 ISO 10mm 400 150 400-1000 ESDISO12-25



  • The shanks on the Pro-Step drill bits are deliberately ground "lobed" (out of round). This prevents them slipping in the power tool chuck. Chucks should be tightened onto the lowest points of the lobed shank.


Material Chart





Tags: How to drill a hole in metal, EMWSD04-22, EMWSD05-35, ESD16-25, ESD16-32, ESDISO12-25, Metal Cutting, Trunking, Sheet Steel, Cabinets, Cladding, Switchgear, Non-Ferrous Metals, Plastics, Formica, Plywood, Multicut, Step Drill, Step


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