Mengshen HSS Step Drill Bit Set 10-45mm Spiral Flute, Triangle Shank High Speed Steel Large Bit Nitride Pagoda Step Drill for Carbon Steel, Sheet Iron, Insulation Boards, PVC Boards,Planks, Black

• High Speed Steel - Suitable for below 25 hardness of the work piece, such as carbon steel, sheet iron, insulation boards, PVC boards, planks, and wood thickness below 5MM.
• Made with drop forged heat treated high speed steel (HSS) with titanium nitride coating for longer life time.
• Good Design - Triangle shank fits into power tools chuck securely and eliminates slip; two-flute design clears chips faster and allows particles to escape easily.
• You can use water to cooling it when it is work and it can be used for even longer.
• A necessity for family or handyman or professionals - Perfect for home repairs and light jobs such as drilling holes in plastic, aluminum, copper and many other types of sheet metal.

Mengshen 10-45mm Nitride Step Drill Bit, Spiral Flute Hex Shank HSS Step Drill Bit Set High Speed Steel Large Bit Pagoda Drill for Carbon Steel, Sheet Iron, Insulation Boards, PVC Boards, Planks. Features: 1. High speed steel for longer service life; 2. Triangle shank prevents slip in drill chuck; 3. Double cutting blades design enables a faster and smoother cutting; 4. 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. 5. The sharpness ensure easily cut through most sheet metal, plastic and some other materials with ease. Specifications: Material: High speed steel Size: 10-45MM (8 step：10mm, 15mm, 20mm, 25mm, 30mm, 35mm, 40mm, 45mm) Package included: 1 x Drill Bit