The Irwin Step Drill Bits are designed for precise drilling in thin materials and have a single flute for maximum drilling control into sheet metal. Their unique flute design ensures perfect round holes in sheet metal. A fluted shank also prevents the drill bit from slipping in the chuck, along with a self centring point that will not walk and eliminates centre punching. Made from industrial grade M7 high-speed steel. Irwin Step Drill Bit. Number of hole sizes: 10. Hole diameters: 5, 7.5, 10, 12.5, 15.2, 18.6, 20.4, 22.5, 25.5 and 28.3mm. https://elecena.pl/product/27222330/irwin-xae-10502855-step-drill-bit-5-28-3-mm-10-hole 2024-11-11 https://elecena.pl/product/27222330/irwin-xae-10502855-step-drill-bit-5-28-3-mm-10-hole 2025-03-12 https://elecena.pl/product/27222330/irwin-xae-10502855-step-drill-bit-5-28-3-mm-10-hole 2026-05-03 https://elecena.pl/product/27222330/irwin-xae-10502855-step-drill-bit-5-28-3-mm-10-hole 2026-07-10