Irwin 4mm to 12mm by 1mm Metric H.S.S. Uncoated Step Drill

Up to 13 different hole sizes without changing bits!

Applications:

• Specially step drill designed to machine a large number or different hole diameters with a single tool.
• Single cutting edge creates perfectly round holes in metal, plastic, wood and other thin materials without center punching.
• Conical design permits as many as 13 different size holes to be drilled with one drill.
• These drills, depending on the model, have a step 1/8″ to 3/8″ (3.5mm to 11mm) thick between sizes.
• Normally intended for use with thin materials.
• Two general variations are available for either self-starting hole or for enlarging existing holes.
• 20 different models are available to produce holes from 1/8″ to 1-3/8″ or 4mm to 35mm.
• The hardened, high speed steel drill body is available in either an uncoated style or with a TiN coating for longer life in tougher materials.
• Single flute design helps to ensure perfectly round holes in a wide range of ferrous, non ferrous and non-metallic materials.

Features:

• Right hand clockwise rotation cutting direction.
• Single straight flute design.
• Multi-step design with progressively larger holes.
• Self-starting or hole enlarging style.
• Straight shank diameters of 1/4″, 3/8″, or 1/2″ (6.5mm, 10mm or 13mm).
• Made in U.S.A.

Cobalt:

• M35 grade provides high heat abrasion resistance.
• Longest cutting life.
• 6 times longer life vs. competition.

Technical Data:

• Manufactured from high speed steel.
• 1/8″ to 3/8″ (3.5mm to 11mm).
• Ground from solid.
• Cylindrically ground.
• Bright finish.