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: 13.Hole diameters: 5 7.5 10 13 16 19 21 23 26 29 31 33 and 35.PTDIRW10502854
