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A. Size 1 covers Ø4-12mm, Size 2 covers Ø4-20mm in 2mm increments, and Size 3 covers Ø4-32mm in 2mm increments - 18 different hole sizes in total across the three bits.
A. The step drills are made from HSS M2 high-speed steel with 5% cobalt.
A. The double spiral flutes provide efficient swarf clearance, allowing clog-free, precision drilling.
A. The three bits together cover 18 different hole sizes.
A. Yes, the set is supplied in a storage case.
A. Yes. Alternative step drill options include AK4733, AK4746, and AK4749.
A. The AK4743 uses double spiral flutes rather than straight flutes, which the manufacturer states provides more efficient swarf clearance for clog-free drilling.
A. Standard UK mainland delivery is 3-5 working days.
A. We accept all major credit and debit cards, along with PayPal.
A. Yes. Please contact Parts for Machines via the website or phone for pre-sales advice on compatibility or specification.
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