Holemaker Step Drill Spiral Flute 4-20mm

SPIRAL FLUTE STEP DRILLS • The Titanium Nitride coating significantly increases the tool life by providing the following benefits: • Increases surface hardness to 85HRC • Ceramic surface reducing friction by up to 30% • Especially resistant to cold welding. • Suitable for cutting a wide range of materials. Sizes Included: 4 6 8 10 12 14 16 18 20mm Step Length: 3.0mm Overall Length: 74.5mm Shank: 8mm