Drillpro HRC89 AlTiN Coating Step Drill Bit 4-20mm HSS M35 Cobalt Step Cone Drill Bit Hole Cutter

Description: Drillpro HRC89 AlTiN Coating Step Drill Bit 4-20mm HSS M35 Cobalt Step Cone Drill Bit Hole Cutter Specification: Brand: Drillpro Material: HSS-Co/M35 Coating: AlTiN Coating Hardness: HRC89 Step: 9 steps Size: 4, 6, 8, 10, 12, 14, 16, 18, 20mm(4-20mm) Shank Size: 1/4" Hex Shank Features: 1. Hardness up to HRC89, perfect to drill 304 stainless steel, wood, iron, aluminum alloy, insulation boards, PVC sheet. 2. Industrial Grade TiALN Coating,TiAlN coating surface will form Al2O3 which form a hard protective layer when drilling. (Perfect for high speed drilling) 3. Service life is 5-10 times longer than general step drill. (Can drilling without coolant, with coolant, service life will be longer and performance will be better.) 4: 118 X Bit Design, you can drill from any angle, no slipping. 5: Great chip removal, small resistance, geat heat dissipation. 6: HIgh precision, no burr when drilling. 7: Easy to install Package Included: 1 x Drillpro HRC89 AlTiN Coating Step Drill Bit 4-20mm More Details: