Meichoon Step Drill Bit 4-20mm, Cobalt HSS M35 Spiral Groove Large Bit Pagoda Step Drill Bit Set Hole Reamer Triangle Handle HSS Co Drilling Counterbore DC17A

High Hardness - Meichoon M35 Cobalt Step Drill Bits is made of high speed steel together with cobalt, which lasts the bit a long using life. Features: 1. High speed steel for longer service life; 2. Double cutting blades design enables a faster and smoother cutting; 3. The advanced double spiral flute design outperforms straight flute design and extends the life of the bit. The split point tip increases speed, and they also include laser-engraved measurements to increase step visibility. 4. The sharpness ensure easily cut through most sheet metal, plastic and some other materials with ease.      Specifications: Material: High speed steel Sizes of the Step Drill Bits: 9 Steps (4mm, 6mm, 8mm, 10mm, 12mm, 14mm, 16mm, 18mm, 20mm)      Package included: 1 x  4-20mm M35 HSS Co Drill Bit