IRWIN Step Drill Bit 4-22mm (10 Holes)
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 witha self centering 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: 4, 6, 8, 10,12, 14, 16, 18, 20 and 22mm.