General description Sealey Double Flute HSS M2 Step Drill Bit Set includes three high-speed HSS M2 double flute step drills designed for efficient and clog-free drilling. This set allows for precision drilling of 18 different size holes using just three bits, making it a versatile addition to any toolkit. The bits are supplied in a convenient flip-up metal case for easy storage and transport. Technical specifications Model No.: AK4733 Size #1: Ø4-12mm Size #2: Ø4-22mm in 2mm increments Size #3: Ø4-30mm in 2mm increments Other information