Combination Drill & Taps
Drill Bit 5A Carbide Tip Hole Saw 12-120mm Drill Bit Set Hole Saw For Stainless Steel Metal Alloy Drilling 1Pcs
See the second picture for details

Precautions:
1. Check whether the center drill is tightened, turn on the machine and check the concentricity of the hole saw. When drilling, place the hole saw perpendicular to the metal, otherwise the alloy will fall off easily. It is best to use cutting fluid to cool down the thick metal
2. Please follow the drilling speed table when drilling, otherwise it is easy to damage the hole saw
3. When using a hand drill, make sure that the hole saw is perpendicular to the metal, it is best to use a bench drill to operate