Irwin UNIBIT High Speed Steel & M35 Cobalt Step Drills & Sets

Irwin UNIBIT High Speed Steel & M35 Cobalt Step Drills & Sets

• Up to 13 different hole sizes without changing bits
• Applications:
• Specialty step drill designed to machine a large number of different hole diameters with a single tool.
• Single cutting edge creates perfectly round holes in metal, plastic, and wood without center punching.
• For use with thin materials.
• Two general variations are available for either self-starting holes or for enlarging existing holes.
• 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.
• Multi-step design with progressively larger holes.
• Self-starting or hole enlarging styles.
• Straight shank diameters of 1/4", 3/8" or 1/2" (6.5mm, 10mm, or 13mm).
• Single Flute.
• Hardness: 58 to 60 RC
• 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.
• 20 different models are available to produces 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.

Cobalt

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